Answer: The atmosphere of the early Earth consists mainly of carbon dioxide and nitrogen, with little or no oxygen. In this case, the ancient prokaryotes are anaerobic, which evolved in the absence of oxygen. Eventually, when photosynthetic bacteria became common, they released oxygen and changed the Earth's atmosphere.
Explanation: i took a test with this on it, i hope my answer helps
The effect on an organism or population of chemical exposure is called __________.
A)
natural hazard
B)
gene-environment interactions
C)
physiology
D)
dose response
E)
heredity
Select the correct answer.
Density is mass divided by volume (d = m ÷ v). Based on the graph, what happens to a fixed mass of water when it is cooled from 4°C to 0°C?
A.
volume increases and density decreases
B.
volume decreases and density increases
C.
volume increases and density increases
D.
volume decreases and density decreases
Answer:
The answer is A, Volume increases and density decreases
Explanation:
When water is cooled from 4°C to 0°C, the volume of water increases and density decreases. Thus, the correct option is A.
What is the Density of water?The density of water may be defined as the weight of the water per unit volume, which depends on the temperature of the water. The normal density of water is 997 kg/m³.
When the temperature of liquid goes down, the density of its gradually decreases, as a result of this, the volume considerably increases.
Therefore, the correct option for this question is A.
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A(n)
is a group of organisms that can mate and produce offspring that can mate.
Answer:
Species
Explanation:
Brainliest?
Which statement is true?
1. Friction is a force that causes moving objects to stop.
2. Energy is lost when friction stops an object with heat.
3. Energy is present in moving objects but not stopped ones.
The answer is 1st statement.
Answer:
Explanation: The force which opposes the relative motion between 2 surfaces in contact is known as friction.
what type of plant community will develop at an average annual temperature of 15 C and an average annual precipitation of 150 cm
Answer:801
Explanation:e bhbiiyhihiu
Does the distance from earth to sun determine the seasons? please explain
Answer:
nope
Explanation:
Contrary to popular belief, the seasons are not determined by the earth's distance from the sun. The seasons are actually caused by the earth's tilted axis. Because the axis is tilted, when the Northern Hemisphere is tilted towards the sun, it's warm.
hope this helps:)
pllsssssss help i will mark brainliest
Answer:
EU genes enclosed in nuclei, contain organelles,
BOth rigid cell wall, bacteria, divide by mitosis
Pro genes float fee in cytoplasm
Explanation:
Which of the following statements is true?
Answer:
3rd one humans and Chimpanzees both evolved from a common ancestor
where do women settlements flourish
Answer:
Favorable geographic as well as environmental conditions.
Explanation:
Human settlement flourish at that place where favorable geographic as well as environmental conditions are available such as availability of water , a suitable climate, fertile land etc. these resources attracts human to settle there due to availability of basic needs. If these natural resources are not present in a location so people does not came to settle there.
Within a species of jungle beetles, some beetles are fast-walkers and some are slow-walkers. Some beetles are brown and some are green. Some beetles can fly and some cannot. This species of beetles shows
Answer:
variation
Explanation: I took the test
Answer:
variation
Explanation:
One difference between gene mutation and chromosomal mutation that
Answer:
c. A chromosomal mutation can change the total number of chromosomes in the cell.
Explanation:
A gene mutation affects a single gene, and replication error is the main cause of gene mutation. A chromosomal mutation affects one part of chromosome or full chromosome. error in meiosis is the main cause of chromosomal mutation. Both mutations are responsible for a change in DNA. A chromosomal mutation leads to the change in total number of chromosomes in the cell.
The movement of the ________ causes the crust to break apart into large plates.
A) mantle
B) crust
C) outer core
D) inner core
Answer:
mantle maybe
..!°π°!..
7. Explain what genetic counseling is and how pedigrees and amniocentesis are used.
Answer:
Pedigrees are used by genetic counselors to study family history and search for trends that may indicate a risk in the family for genetic abnormalities or health-related conditions.
Based on the cell theory, which of the following is true? (5 points)
a
All cells are too small to be seen.
b
All living things are made of cells.
c
Small organisms have more cells than large organisms.
d
Large organisms have larger cells than small organisms.
What is a convergent boundary? Name one example of a convergent boundary.
Answer:
The Washington-Oregon coastline of the United States is an example of this type of convergent plate boundary.
After earthquakes, hot springs sometimes stop bubbling, and new hot springs form. Why might this be
Answer:
The magma moved. The crystaline water is no longer being heated by the magma so it stops being a hot spring.
Answer:
The magma melts
Explanation:
What might happen within an ecosystem if the snake population runs out of small animals to eat such as mice or rabbits?
The inheritance pattern for an autosomal dominant trait is shown in the pedigree. Shaded symbols represent individuals that express the dominant trait. Based on this pedigree, what are the most likely genotypes of individuals I-1 and I-2? I-1: aa I-2: Aa I-1: AA I-2: Aa I-1: Aa I-2: aa I-1: aa I-2: AA
Answer: c
Explanation:
Can you guys help me please I’ve gotten to many wrong already.
Answer:
I would say A
Explanation:
Which correctly shows the temperature relationship among the layers of the Sun?
Answer:
The inner layers are the Core, Radiative Zone and Convection Zone. The outer layers are the Photosphere, the Chromosphere, the Transition Region and the Corona.
Explanation: The outer layers are the Photosphere, the Chromosphere, the Transition Region and the Corona.
Plant cells have some organelles that animal cells do not. Check all organelles that ONLY plant cells have.
A
chloroplast
B
nucleus
C
cell membrane
D
cytoplasm
E
cell wall
F
mitochondria
Answer: Plant cells only have chloroplast and a cell wall. Which is A and E.
Assessment started: undefined.
Item 1
Which example is the best description of an adaptation?
a heritable characteristic that helps an organism avoid predators
a heritable characteristic that helps an organism find food
a heritable characteristic that helps an organism survive and reproduce
a heritable characteristic that evolves
Answer: a heritable characteristic that helps an organism survive and reproduce
Explanation:
How does the lipid portion help maintain water concentration on each side of the bilateral?
Answer:
Explanation:The phospholipid bilayer formed by these interactions makes a good barrier between the interior and exterior of the cell, because water and other polar or charged substances cannot easily cross the hydrophobic core of the membrane. Can water cross the plasma membrane at all?
It also helps the cell move things in and out. The cell membrane is made of what is called a phospholipid bilayer, which means it has two layers of phospholipids. ... This allows the phosphates to be exposed to water, either in the cell or the environment, while the lipids are protected from water Lipids are essential for all life on Earth. They play many important roles in maintaining the health of an organism. Arguably the most important function lipids perform is as the building blocks of cellular membranes. Other functions include energy storage, insulation, cellular communication and protection.Large quantities of water molecules constantly move across cell membranes by simple diffusion, often facilitated by movement through membrane proteins, including aquaporins. In general, net movement of water into or out of cells is negligible.
What perspective maintains that generalized anxiety disorder develops as a result of exposure to threatening environments?
Answer:
sociocultural
Explanation:
Sociocultural maintains that generalized anxiety disorder develops as a result of exposure to threatening environments.
Sociocultural means combining social and cultural factors.
The focus of study in anthropology is an example of sociocultural.
The theory of sociocultural perspective explains how behaviors of individuals are affected by their social and cultural factors.
PLEASE HELP BRAINLIEST. I'LL GIVE YOU 15 POINTS (science-8th grade)
Part 1: Which process does arrow F represent?
Part 2: Explain how matter is conserved during the process.
Part 3: Justify why this process is a recycling of carbon in the carbon cycle.
Use complete sentences to explain your answer.
Answer: Process F represents photosynthesis,
The AMOUNT of oxygen and carbon atoms released by photosynthesis are EXACTLY EQUAL to the atoms of these materials contained in carbon-dioxide converted.
this process recycles carbon by absorbing it from the air or soil to create oxygen and glucose
Explanation:
Bacteria and viruses that cause disease can disrupt homeostasis and make you sick.
true
false
Answer:
TRUE
Explanation:
bacteria can also disrupt homeostasis in your body, and can make you sick. Any substance that causes the disease is called a pathogen. Your body reacts to pathogens to try and maintain homeostasis, and certain symptoms will appear as your body tries to get back on track.
13. What led to the application of ethical standards to relationships between people and their environment?
Answer:
★ People's awareness of the environmental changes brought about by industrialization
Explanation:
Hope you have a great day :)
Industrial Revolution was the phenomenon that led to the application of ethical standards to relationships between people and their environment.
Environmental ethics is a current philosophical thought that originated after the Industrial Revolution as a result of the environmental damage that had been done to different ecosystems and species as a result of the industrial revolution.
Environmental ethics proposes a modification in the relationships between human beings and their environment from a moral perspective to ensure the preservation or restoration of said natural values.
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Which of the following describes how Earth's atmosphere changed during Precambrian time?
A. The amount of carbon dioxide increased.
B. Torrential rains never reached the surface until the Paleozoic era.
C. The amount of oxygen increased.
D. Precambrian oxygen was quickly used up by plants.
Answer:
c
Explanation:
During Precambrian time, The amount of oxygen increased in the earth's atmosphere. Therefore, option C is correct.
What is the Precambrian time period?From roughly 4.6 billion years ago, when Earth first started to form, to the start of the Cambrian Period, 541 million years ago, is the Precambrian Period. It is the earliest era which is followed by the Cambrian period.
Large objects bombarded the Precambrian Earth, the crust was split into the first continents and ocean basins, crustal plates were mobilized, the atmosphere changed from reducing to oxidizing, and early life began and evolved. Climate and geologic events are responsible for the end of this period.
During this period, the amount of oxygen increased rapidly. Therefore, option C is correct.
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How does endoplasmic reticulum arise?.
Explanation:
it arrises from the nucleus. that is why most of the eukaryotic cells have endoplasmic reticulum. The membranes of the ER are continuous with the outer nuclear membrane
Plz Help
A population of wolves migrate North in search of food. As the wolves travel they enter a region that has long, snowy Winters. This makes them better able to sneak up on prey.
A.) Give two reasons that the population is not a Hardy Weinberg equilibrium.
C.) How are the allele frequency change in the wolf population
Answer:
A, This is the case of selective pressure of environmental factors like snow, due to which favored the expression of the allele that formed white coat phenotype. This is not a Hardy-Weinberg principle, in which no selective pressure is applied. The relative frequencies of the alleles change in the gene pool, due to selective pressure, and the expressed alleles are often significant for survival in those conditions.
b,HW equilibrium means no selective pressures like the long, snowy winters selectively favoring the white coat phenotype over the other coat phenotypes. Selective pressures change the relative frequencies of the alleles in the gene pool. It also means the population does not have either immigration or emigration to change the ratios of alleles in the gene pool The Hardy-Weinberg principle of genetic equilibrium tells us what to expect when a sexually reproducing population has no selection pressure, no gene flow, no nonrandom mating, not even genetic drift.
C, ?? I don’t know
Explanation: