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ankoles [38]
2 years ago
9

The picture represents a structure of the respiratory system.

Biology
1 answer:
marusya05 [52]2 years ago
3 0

Answer:

ITS B

Explanation:

to exchange oxygen with carbon dioxide

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What three processes lead to variation among offspring that have the same two parents?
beks73 [17]

Explanation:

Genetic variation in offspring during sexual reproduction is caused by

  • crossing over
  • independent assortment
  • randomized fertilization

Further Explanation:

All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wound around histones as chromosomes. To produce daughter cells during cell division, the chromosomes (total number of chromosomes (2n)) are copied before the cell splits into two daughter cells. This process is known as mitosis, and occurs in cell division and growth processes. Two new nuclei are formed, along with identical cells. These are the same as the parent cell and the chromosome number (2n) is maintained.

Conversely in meiosis, the number of chromosomes (2n) is halved through meiotic divisions, producing 4 (n) germ cells (sperm or eggs), each containing half the number of chromosomes as its parent cell.

  • crossing over:  the exchange of segments of chromosome, between non-sister homologous or similar chromatids crossing over happens at chiasmata, the point where non-sister chromosomes are joined.
  • independent assortment in metaphase I of meiosis: chromosomes align independently and genes segregate independently into new combinations ...in humans 2n, n = 23, 8 million combinations of chromosomes possible
  • randomized fertilization: sperm cells fertilize an ovum to form a zygote. This occurs randomly by chance, to result in a complete set of chromosomes 2n, that is a novel combination of half each parent's number of chromosomes

Learn more about mitosis at brainly.com/question/4303192

Learn more about transcription at brainly.com/question/11339456

Learn more about DNA and RNA at brainly.com/question/2416343?source=aid8411316

#LearnWithBrainly

9 0
3 years ago
Why must an experiment or a survey be controlled? What is the difference between the control group and the experimental group in
notka56 [123]
An experiment or survey must be controlled in order to receive accurate results.

In an experimental group, the independent variable is changed. But in the control group, the independent variable stays the same.
5 0
3 years ago
Read 2 more answers
The atomic mass of an element is equal to the:
arlik [135]

The answer should be the third option "number of protons and neutrons." The atomic mass of a element is equal to the amount of protons, and neutrons added together in that element. So for example if we are trying to find the atomic mass of hydrogen you would add the total amount of protons and neutrons together to find it's mass although it doesn't equal the exact amount of it's mass but it's close.

Hope this helps.

4 0
3 years ago
The parietal cells of the stomach secrete ______________, while the chief cells secrete ______________.
babunello [35]

Explanation:

The two main types of exocrine secretory cells of the stomach are parietal cells and chief cells. Parietal cells secrete hydrochloric acid and chief cells secrete digestive enzymes such as pepsin

7 0
2 years ago
What is likely to happen if an animal species grows larger than the carrying
lara31 [8.8K]
B. Because the environment can not supply for the food and caring of the animal species that is growing larger.
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