Answer:
Because they don't have fertilizer.
Explanation:
Well, if this was a long time ago, then farmers did not have fertilizer. So, there are bacteria on the roots of plants that convert nitrogen into a usable form. It's very important for growing, and when farmers harvest the crop, not much of the nitrogen is returned to the land, so it is not as fertile. Fertilizer is largely consisted of nitrogen, so that is why farmers use fertilizers today. But "a long time ago," farmers did not have fertilizer.
OLEASE HELP!! (DONT FAKE ANSWER PLZ)
Answer:
15 - a. twice
15 - c. Winter, shortest
15 - d. Summer, longest
16 - a. equal night
16 - b. 12, 12
16 - c. twice
16 - d. vernal, March 21st
16 - e. September 23rd
Explanation: Good luck! :D
where is the fertilization in plant take place
Answer:
Fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule. It occurs in ovary of female flower
Explanation:
After pollen grains land on the stigma, a pollen tube grows from the pollen grain, through the style, and into the ovary. Sperm cells inside the pollen grain travel down the pollen tube and into the ovary which contains the ovules.
______________*_______*________________
Stay safe,stay healthy and be blessed.
This type of energy is not always predictable.
Answer:
Wind energy.
Explanation:
In this way, the biggest shortcoming of wind energy, which is that it is not always stable and predictable, is solved by the new technology. It goes without saying that this impressive and innovative combination of wind as a renewable energy source and the power of water as storage energy has a lot to offer in the energy production field.
How does DNA replication in prokaryotes differ from replication in eukaryotes?
Prokaryotic chromosomes have telomeres, and eukaryotic chromosomes do not.
Prokaryotic chromosomes have a single origin of replication, while eukaryotic chromosomes have many.
The prokaryotic DNA had multiple parts to be replicated, compared to one long chromosome in eukaryotes.
The rate of elongation during replication is slower in prokaryotes than in eukaryotes.
Answer:
Prokaryotic chromosomes have a single origin of replication, while eukaryotic chromosomes have many.
Explanation:
If eukaryotic chromosomes did not have many origins of replications then replication would take insanely long due to how much longer eukaryotic genes are!
why is important to use an organism with a recessive phenotype in a cross with an organism of unknown Genotype
Answer:
One of the central conclusions Mendel reached after studying and breeding multiple generations of pea plants was the idea that "[you cannot] draw from the external resemblances [any] conclusions as to [the plants'] internal nature." Today, scientists use the word "phenotype" to refer to what Mendel termed an organism's "external resemblance," and the word "genotype" to refer to what Mendel termed an organism's "internal nature." Thus, to restate Mendel's conclusion in modern terms, an organism's genotype cannot be inferred by simply observing its phenotype. Indeed, Mendel's experiments revealed that phenotypes could be hidden in one generation, only to reemerge in subsequent generations. Mendel thus wondered how organisms preserved the "elementen" (or hereditary material) associated with these traits in the intervening generation, when the traits were hidden from view.
It is important to use an organism with a recessive phenotype in a cross with an organism of an unknown genotype to identify the recessive traits.
What are phenotype and genotype?The observable traits of an individual are the result of gene expression; the clinical manifestation of a person with a certain genotype is called the phenotype of an individual. Some examples of the phenotype are height, skin color, eye color, hair nature, etc.
The term "genotype" refers to an organism's whole gene pool, or, in other words, the genetic makeup of that creature. The phrase can also be used to describe the alleles, or different forms of a gene, that an organism carries in a more specific meaning.
A recessive phenotype is used in a cross with an organism of unknown Genotype to identify the recessive traits.
Learn more about phenotype and genotype, here:
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Please help will mark brainliest!
Discuss how can the genotypes and phenotypes of potential offspring be predicted. Explain why some traits appear in a population more often than in others.
Answer:
You can predict geno/pheno types using a Punnet square.
Explanation:
Some traits appear more often because they are dominant. Dominant traits win out over recessive genes.
class 10 bio notes of chapter our environment
Answer:
Explanation: The environment in totality is responsible for life on Earth. Class 10th Biology Our Environment notes tell that environment consists of both biotic and abiotic factors. While biotic factors refer to living things, abiotic factors refer to non-living things.
need help will give brainlist (don't know if a is correct)
Answer:
Definitely A. is correct. :D
Explanation:
A branch from a tree and a dichotomous key are shown below.
What type of tree produced the branch?
A. locust
B. ash
C. cedar
D. magnolia
what would happen if there was an issue during transcription
Hello! I have to write an essay based on the Water Cycle and what it is/does. I will give Brainliest for the correct answer. I will also give 20 points to whoever writes the essay, and has the correct answer. Good luck.
Answer: The water cycle also known as the hydrolic cycle describes the always foward rotation above and below the surfaces of the earth. The mass of water on earths surface remains fairly consistant. However, the water splits up into diffrent groups, freshwater, saline water, ice, and atmospheric water. The water can travel between catorgories such as river to ocean or ocean to atmosphere through evaporation, condensation, precipatation, surface runoff and subsurface flow. When water go through these physical process it can change aswell such as being a liquid, solid,and gas. During evaporation it takes water from it surroundings and cools its enviromwnt,
the exchanges in heat fluctuate the climates tempature.
PLEASE HELP WILL GIVE BRAINLIEST AND 23 POINTS!! Based on the data provided in this activity, what type of liquid seawater, in terms of salinity and temperature, will generally be the densest?
Answer:
Seawater that is very cold (around 4°C) and that has a high salt content will generally be the densest formulation.
Explanation:
plato
PLZ HELP The diagram below shows a segment of the amino acid sequence from the hemoglobin protein from several organisms
COMPARISON OF AMINO ACID SEGMENTS OF HEMOGLOBIN PROTEIN
102 103 104 105 106 107 108 109 110 111 112
112 113 114 115 116
Chimp ASN PHEARG LEU LEUGLY ASN VAL LEU VAL CYS VALLEU ALA HIS
Gorilla
ASN PHE LYS LEU ALA GLY ASN VAL LEU VAL CYSVALLEU ALA HIS
Horse ASN PHE ARG LEULEU GLY
GLY ASN
ASNVAL LEUALA LEU VAL VAL ALA ARG
Human ASN PHE ARG LEU LEU GLY ASN VALLEU VALCYS | VALLEU ALA HIS
Monkey ASN PHELYS LEU ALAGLY ASN VALLE VALCYSVALLEU ALA HIS
Kangaroo ASN PHELYS LEU LEUGLY ASN ILE ILE VALLECYS LEUALA GLU
What conclusion can you draw from the information in the chart?
The gorilla and human are the most closely related organisms with the fewest differences in their amino acid sequences
O The chimp and human are the most closely related organisms with the fewest differences in their amino acid sequences.
The human and horse are the most closely related organisms with the fewest differences in their amino acid sequences.
The monkey and gorilla are the most closely related organisms with the fewest differences in their amino acid sequences.
Answer:
B. The chimp and human are the most closely related organisms with the fewest differences in their amino acid sequence
Explanation:
This question shows a table containing the amino acid sequence of haemoglobin protein in different organisms. According to the table attached, a total of 15 amino acids are represented for each organism. A very reliable evidence that shows the relationship between organisms i.e. how related they are, is their DNA SEQUENCE.
Since the amino acid sequence of the protein in an organism is determined by the DNA sequence, organisms with very similar amino acid sequence are said to be CLOSELY RELATED. Hence, the similar the DNA sequence, the closer the relationship between organisms. In this case, the chimp and human have the same set of amino acids in their sequences, hence, they are the most closely related organisms with the fewest differences in their amino acid sequence.
Answer:
IS IT B OR D?
Explanation:
2. The text explains that selective breeding involves breeding animals or plants for
specific desirable traits. For example, humans bred different types of dogs to
accomplish certain jobs. Farmers breed chickens for having more meat and laying a
greater amount of eggs. Cattle are often selectively bred either for more meat or for
more milk production. The text also notes that breeding animals for size and strength
interferes with natural animal processes.
Based on this information presented in the text, who benefits from the traits different
animals are bred for?
A. humans breeding the animals
B. the animals being bred by the humans
C. both the humans breeding the animals and the animals being bred by the humans
D. animals not being bred by humans
Answer:
A. the humans breeding the animals
Explanation:
It says in there that it interferes with the natural animal processes so it probably doesn't help the animal, and it also said in there that we have breed for more desirable traits in other words we bred them to be more useful to us and give us benefits.
Populations must be able to adapt to environmental pressures or face extinction.
In the bug hunt simulation, how did the bugs adapt? *
Answer:
death
Explanation:
Answer:
death
Explanation:
i took the test
A cow eating grass is what type of symbiotic relationship
Answer:
COMMENSALISM
Explanation:
An example of commensalism in the grasslands is when the cattle graze the grass, the insects disturb insects that live inside the grass. The cattle egrets eat the disturbed insects and they benefit from this action, but the cattle is not affected by this.
Hope it helps!
What is a reason WHY energy is lost in food chains? A Organisms are part of many different food chains. B Energy moves from level to level. C Animals do not use all the energy from the plants. D The bottom levels have more energy than the top levels.
Answer:
A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. ... Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems.
Explanation:
Which is true about reflected light?
why is the cell theory and the theory of evolution considered theories ?
Answer:A scientific theory is a broad explanation for events that is widely accepted as true. Evolution is a change in species over time. Evolution occurs by natural selection. The cell theory states that all living things are made up of cells, and living cells always come from other living cells.
Explanation:
______ fats, such as olive oil and sesame oil, are produced in plants and are liquid at room temperature.
Select one:
a.
Hydrogenated
b.
Oxidized
c.
Saturated
d.
Unsaturated
Answer:
d. Unsaturated fats
Explanation:
They're liquid at room temperature, like mentioned. Other examples are avocado oils and pumpkin seeds.
How can I grow my nails?
The diagram above shows the process of
natural selection. What is X?
A competition
B evolution
Cmimicry
D reproduction
Answer:
The answer is reproduction
Explanation:
because it need generation to keep on going with the cycle
Answer: D.) Reproduction
How do you think meteorologists predicted the
arrival of a hurricane before the 1990s?
(Please help with a short sentence)
please help me i need it please
Answer:
first one is false
Explanation:
A population of rabbits in an ecosystem has genetic variation in fur thickness. Some rabbits have thick fur and others have thin fur. Due to changes in the environment, the average temperature of the ecosystem is steadily increasing.
How will this environmental change likely affect the rabbit population over time?
A. Rabbits with thick fur will become more common in the population because thick fur will be a favorable trait in this changing environment.
B. Rabbits with thin fur will become more common in the population because these rabbits are more likely to survive and successfully reproduce.
C. Rabbits with thick fur and thin fur will become equally distributed because all rabbits in the population will successfully reproduce.
D. Rabbits with both fur types will increase in the population because the temperature change will cause the population of rabbits to expand.
Answer:
B
Explanation:
Thin fur is better for warmer weather, so the rabbits with thinner fur won't over heat in the warming weather.
The population of rabbits n the genetic ecosystem has thick fur and others have thin fur, due to the changes in the climate avg temperature of the ecosystem is steadily falling.
Looking at the situation and adaptive powers or abilities of the animals the thick fur will survive longer than those of the thin fur as the temperature of the place is declining.Hence the option A is correct.
Learn more about thein an ecosystem has a genetic variation
brainly.com/question/20988797.
why is negative feedback loop more common than positive feedback loop?
Answer:
what are you even talking about
Explanation:
temperature of a substance is determined by
A. how fast the molecules of a substance are moving
B. how hot or cold it is
C. how slow the molecules of a substance are moving
D. what the thermometer says
It is the c believe me I am trustworthy
(Meme attached for you.)
The following original section of DNA is replicated, and a mutation occurs in the sequence. Compare the original sequence to the copied sequence. Which type of mutation occurred?
The original DNA.
TTACGGCCTA
The copied DNA.
TTACGCCTA
1. Physical
2. insertion
3. Deletion
4. substitution
3. Deletion
Explanation:
The original DNA is TTACGGCCTA when the copied one misses the second G
TTACGGCCTA
TTAC GCCTA
The empty space is where the deletion happened.
Marc and Dan are twins who like the same activities, and foods. At a recent doctor's appointment, Dan was told that he has type 2 diabetes. He has been feeling good and has not noticed any changes in his health. He does not understand why he has diabetes but this brother does not and why he has not had any noticeable symptoms. How would you explain this to him? Describe what the glycemic index is and how this is very important in developing a nutritional diet.
Answer:
The glycemic index allows people with diabetes to follow a balanced diet by consuming foods with a low glycemic index, which helps to avoid increasing the level of sugar in the blood.
Explanation:
The glycemic index is important to know when a certain food raises the level of sugar in the blood.
A good diet for people with diabetes is determined by foods that have a low glycemic index between 1 to 55; Some of the foods that can help us regulate the level of sugar in the blood are the following:
- Breads and cereals that are exclusively whole grains.
-Legumes like beans and lentils.
-Fruits such as: peach, pear, apples, cherries and prunes.
Human babies have a gene that produces an enzyme that breaks down the sugar found in milk. Over time, this gene is shut off in most adult humans. A mutation in this gene allows some adults to continue to drink milk without discomfort. Why would this mutation have allowed early humans to survive?
A- it provided milk free from bacteria
B- it provided vitamins that could only be produced in milk
C- it provided more cattle that could be raised by early humans.
D- it provided an alternative source of nourishment for early humans.
Answer:
I think it would be d
Explanation: