The pattern in the fossil record which supports the idea of a mass extinction event is the sharp decrease in biodiversity in rock layers.
What is a mass extinction event?A mass extinction event is one which in which a large number of species of organisms die off due to natural or artificial causes.
A mass extinction events is concluded to have killed the dinosaurs and other species, in part as a result of an asteroid striking the planet.
The evidence for this in fossils records is that the lower, older rock layers contains a great diversity of fossil life forms, while the younger layer immediately above is contains few organisms in comparison.
Therefore, the sharp decrease in biodiversity in rock layers provides evidence for a mass extinction event.
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Natural killer (NK) cells ________. A) are also called cytotoxic T cells B) are a type of phagocyte C) are cells of the adaptive immune system D) can kill cancer cells before the immune system is activated
Natural killer (NK) cells are also called cytotoxic T cells (Option A).
What are NK cells?The NK (Natural killer) cells are cytotoxic lymphocytes that trigger responses from the innate immune system.
Natural killer cells are one of the most important types of lymphocytes (white blood cells) in human cells.
These cells have cytotoxic properties because they produce cytotoxic granules and different cytokines.
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A growth chart is used in monitoring the growth and development of a child. the star on the chart represents a girl who is at the doctor for a routine check-up. judging by the location of the star, should the doctor conduct tests to examine her pituitary gland?
No, her height is within normal range, and her pituitary gland is working normally.
Why is the pituitary gland called the master gland?The pituitary gland is occasionally called the "master" gland of the endocrine system because it maintains the functions of many of the other endocrine glands.
The pituitary gland is no larger than a pea and is found at the base of the brain.
Thus, her height is within normal range, and her pituitary gland is working normally.
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What is the general term for viruses and bacteria that make us sick?.
A cement factory emits 900 kilograms of CO2 to produce 1,000 kilograms of cement. A fully grown tree removes six kilograms of CO2 per day from the air. One acre of land can support 200 mature trees.
A company builds a factory that will produce 100,000 kilograms of cement. To make the factory carbon neutral, the owners need to grow
trees over an area of land measuring
acres.
Answer: To make the factory carbon neutral, the owners need to grow 15000 trees over an area of land measuring 75 acres
Explanation:
From the information;
900 kg CO2 = 1000 kg Cement
1 tree = 6 kg CO2
1 acre = 200 trees
100000 kg Cement will require;
=(900 × 100000)/1000
= 90,000 kg of CO2
But 1 tree = 6 kg of CO2
Number of trees = 90,000/6
= 15,000 trees
But, 1 acre = 200 trees
Number of acres = 15,000/200
= 75 acres of land
Therefore;
To make the factory carbon neutral, the owners need to grow 15000 trees over an area of land measuring 75 acres
Answer: a and d
Explanation:
3. How is heat transferred within the Earth?
(5 Points)
O A. by conduction
O B. by radiation
O C. By seismic waves
O d. by gravity
the answer is D
"During convection, heat is being transferred between substances in direct contact with each other by electro magnetic waves."
"Using the molten rock to explain the convection in the earth relative to how if affects the weather condition. Here, the rock is in a molten state, rising up from the bottom of the mantle after becoming hotter and less dense from the heat of the earth's core. As the rock loses heat into the earth's crust, it become cooler and more dense,sinking back to the core. These constantly circulating cells of hotter and cooler molten rock help to heat the earth's surface."
What makes erythrocytes unique from other cellular components of the blood?.
Answer:They contain hemoglobin.
Explanation:
To what level of organization does a paramecium belong to?
The level of organization that a paramecium belongs to is : Unicellular protozoa
What are paramecium?Paramecium are unicellular protozoa that belongs to the kingdom Protista. they are unicellular because they are comprised of a single cell organization. Paramecium are found in aquatic habitats such as freshwater and brackish waters.
Hence we can conclude that The level of organization that a paramecium belongs to is Unicellular.
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How does emissions of carbon dioxide impact climate change?
Answer:
The carbon emissions trap solar energy in the atmosphere which causes global temperatures to increase, this is also called the greenhouse effect. Since the global temperatures will increase, ice in the polar regions will melt causing the water level to increase leading to an influx of problems.
Explanation:
Which statement BEST describes what happens during the S-phase of the cell cycle?
A.Protein synthesis needed for spindle formation and mitosis.
B.DNA replication where the amount of genetic material is doubled.
C.The cell partitions the two copies of genetic material into the two daughter cells.
D.Cell division occurs and two cells are left; thus the cell cycle begins again.
Answer:
B
Explanation:
The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. In this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells.
What gas to trees and other plants REMOVE from the atmosphere, which helps decrease global warming?
I need the answers asap I will mark it
Answer:
Carbon Dioxide or CO2 is removed from atomsphere by trees and other plants through photosynthesis.
Students planned an investigation using pea plants. They compared the rate of oxygen consumption in pea plants that were watered daily to the rate of oxygen consumption in pea plants that were not watered. Which question were these students MOST LIKELY investigating? Do pea plants carry out photosynthesis? Does the amount of water a plant receives affect photosynthesis? © Is the rate of cellular respiration related to the amount of water a plant receives? O Do pea plants carry out cellular respiration?
Answer:B, Does the amount of water a plant receives affect photosynthesis?
Explanation:
help please!!!! it’s called DNA and genetics !!!!!
Answer:
9 is mutations
Explanation:
20. Which of the following statements identifies the relationship between the Miller-Urey Experiment and the
Primordial Soup Hypothesis?
Miller-Urey supported the Primordial Soup Hypothesis because it concluded that organic molecules could be
produced in the presence of certain inorganic conditions of early Earth.
Miller-Urey disproved the Primordial Soup Hypothesis because it concluded that amino acids could be
produced in the presence of certain inorganic conditions of early Earth.
Miller-Urey did not support the Primordial Soup Hypothesis because it did not prove the formation of organic
molecules through a lightning strike hypothesis.
No relationship exists between the two.
Miller-Urey supported the Primordial Soup Hypothesis because it concluded that organic molecules could be
produced in the presence of certain inorganic best explain the relationship between Miller-Urey and Primordial soup.
Miller urey experiment.The Miller Urey experiment refer to a form of chemical experiment that simulated the conditions present on the early Earth and tested the chemical origin of life using those conditions . The experiment performed at the time supported Alexander Oparin's and J. B. S. Haldane's hypothesis that putative conditions on the primitive Earth is important for chemical reactions to produce more complex organic compounds from simpler inorganic precursors.
The first was the “primordial soup” which was a conclusion that when Earth was young, the oceans were filled with simple chemicals important for life and this assemble into living cells.
Therefore, Miller-Urey supported the Primordial Soup Hypothesis because it concluded that organic molecules could be
produced in the presence of certain inorganic best explain the relationship between Miller-Urey and Primordial soup.
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Pollinating bees that visit flowers while harvesting nectar and pollen are considered examples of _____.
Answer:
Mutualism
Explanation:
Sucrose is the assistant of the genius alchemist called.
Answer:
The Answer of your question is Albedo
Which statement describes one way that roots and leaves interact to transport water through plants?
The flow of oxygen out of the stomata of leaves
stimulates the roots to absorb more water for
photosynthesis.
Wilting leaves send chemical signals to the roots,
causing them to take in water at a faster rate.
The evaporation of water through the stomata of
leaves creates a pull that draws water in through the
roots.
Changes in sugar concentration in the phloem of
leaves causes water to move into the roots by
osmosis.
The statement that describes one way that roots and leaves interact to transport water through plants is: evaporation of water through the stomata of leaves creates a pull that draws water in through the roots.
What is transpiration?Transpiration is the process whereby water is lost from the surface of the leaf into the atmosphere.
A process called transpiration pull facilitates the absorption of water by the root hairs of the plant.
The water then moves via the conducting vessel called xylem to other parts of the plant.
Therefore, the statement that describes one way that roots and leaves interact to transport water through plants is: evaporation of water through the stomata of leaves creates a pull that draws water in through the roots.
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Do you think your classroom population is a typical representation of a larger population such as your entire school
My class can not be a representation of the larger school because my class consists of people of the same age bracket and the same level of study.
What is a representative population?A representative population is a population that reflects the whole. A sample must be taken in such a way that it can effectively reflect the components of the whole.
My class can not be a representation of the larger school because my class consists of people of the same age bracket and the same level of study. The school is composed of different classes occupid by students of different age groups and different levels of study.
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based on the Cytochrome C data, which organism is most closely related to human
Based on evolutionary relationship, the most closely related organisms will have the most similarity in Cytochrome C structure.
What is cytochrome C?Cytochrome C is a mitochondrial protein molecule which functions as an electron carrier in the electron transport chain.
Closely related organisms have similarity in genes as well as in protein structure.
The most closely related organisms will have the most similarities in genes and proteins structure.
Therefore, the most closely related organisms will have the most similarity in Cytochrome C.
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While walking a cornfield, you notice roots emerging from the corn stalks themselves, and you suspect that these roots are helping to hold the plants upright. these roots belong to a category of roots known as ________.
a) taproots.
b) fibrous roots.
c) adventitious roots.
d) root hairs.
e) special roots.
Since fibrous roots grow from the side of monocot plants, the plant roots observed on the corn stalk are fibrous roots.
What are fibrous roots?Fibrous roots are roots of plants which are usually seen on the surafce above ground and which grow from the side of plants.
Monocotyledons such as corn have fibrous roots.
The fibrous roots help to provide support and strength to the plant.
Therefore, the plant roots observed on the corn stalk are fibrous roots.
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In the film, Paine recalls that a year after the starfish had been removed, the number of species decreased from 15 to eight, after three years the number went down to seven, and after another seven years it was almost all only mussels. In the control plots, the number and diversity of species were basically unchanged. Which statement(s) best explain(s) these results?
a. Keystone species are critical to the diversity and stability of an ecosystem.
b.When a predator is removed, the prey of that predator always increases, and species not eaten by the predator always decrease.
c. The disappearance of producers from an ecosystem can cause the number of predators to increase
Answer:
please can you short the question , because I don't understand it
what bone was in the spinal cord
Answer:
Vertebrae are the 33 individual bones that interlock with each other to form the spinal column.
Explanation:
The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx (Fig. 2). Only the top 24 bones are moveable; the vertebrae of the sacrum and coccyx are fused.
Where are extrusive igneous rocks typically found? in a canyon in a riverbed near a dormant volcano deep under Earth’s surface
Answer:
near a dormant volcano deep under earths surface
Explanation:
Which base in an anticodon will pair with the base adenine in a codon?.
Answer:
In an anticodon the base that will pair with the base adenine in a codon is uracil.
Explanation:
Please help me. Fill in the blank with the answer
Answer:
Ribose sugar
Explanation:
Ribose sugar
Record the elements present in each unknown astronomical object. Be sure to indicate “yes” or “no” for each element.
Hydrogen Helium Lithium Sodium Carbon Nitrogen
Moon One
Moon Two
Planet One
Planet Two
We record the elements present in each unknown astronomical object according to metallicity.
Moon one - HeliumMoon two - SodiumPlanet one - Hydrogen -Carbon Planet two - Lithium - Nitrogen
To understand these answers, we need to know what metallicity.
What is metallicity?In astronomy and physical cosmology, metallicity (also called Z) of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. Because stars, which make up most of the visible matter in the universe, are composed primarily of hydrogen and helium, astronomers conveniently use the generic term "metal" to describe all other elements collectively.
With this information, we can conclude that we have recorded the elements present in each unknown astronomical object according to metallicity.
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Answer:
Moon 1- is lithium and carbon.
Moon 2- is sodium and nitrogen.
Planet 1- is hydrogen and carbon
Planet 2- is helium and carbon
(type no for each box that isn’t listed above.)
Explanation:
I did the slide show.
HeLPPP
How can we stop carbon dioxide to the ocean to not affect pH levels?
Answer:
Because of human-driven increased levels of carbon dioxide in the atmosphere, there is more CO2 dissolving into the ocean. The ocean's average pH is now around 8.1 , which is basic (or alkaline), but as the ocean continues to absorb more CO2, the pH decreases and the ocean becomes more acidic.
Hope This Helps
Answer:
Carbon dioxide (chemical formula CO2) is a chemical compound occurring as an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas. The current concentration is about 0.04% (412 ppm) by volume, having risen from pre-industrial levels of 280 ppm.[9][10] Natural sources include volcanoes, forest fires, hot springs, and geysers, and it is freed from carbonate rocks by dissolution in water and acids. Because carbon dioxide is soluble in water, it occurs naturally in groundwater, rivers and lakes, ice caps, glaciers, and seawater. It is present in deposits of petroleum and natural gas. Carbon dioxide has a sharp and acidic odor and generates the taste of soda water in the mouth,[11] but at normally encountered concentrations it is odorless.[1]
Explanation:
hope that helps
The image shows an aspect of human culture. Which aspect is illustrated in the image?
Answer: language
Explanation: trust me
Can someone make me a storyline about protist? It doesn’t have to be a whole story but something I can go off of?
Answer:
Protists are a diverse collection of organisms that do not fit into animal, plant, bacteria or fungi groups. While exceptions exist, they are primarily microscopic and made up of a single cell (unicellular), according to the educational website CK-12.
Which of these does NOT greatly affect climate?
A. Earth's Tilt
B. Angle of Sunlight
C. Seasonal Changes
D. Location on Earth
Answer:
D...
Explanation:
How would a harsh winter most likely affect the rabbit population size?
a. population decreases
b. population increases
c. population reaches carrying capacity
d. population completely dies off
Answer:
a
Explanation:
Because a harsh winter will cause food and weather to decrease and almost kill off the rabbits but some will still survive.