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Zinaida [17]
3 years ago
12

Inhalation and exhalation move air into and out of the lungs. what happens when you inhale and exhale?

Biology
1 answer:
klio [65]3 years ago
4 0
When you breathe in your diaphragm contracts and moves downward.this increases the space in your chest cavity into which your lungs expand.the intercoastal between your ribs also help enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale

HOPE THIS HELPED 
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Ordinary cell division produces two daughter cells that are genetically identical. This type of cell division is important for a
Ratling [72]

Answer:

C) production of sperm and eggs

Explanation:

Sperms and eggs are the male and female gametes respectively. Formation of sperms and egg cells require meiotic cell division. Meiosis in sperm mother cells and egg mother cells reduces the chromosome number of half in the sperms and eggs. Meiosis also adds new gene combinations in these gametes by the process of crossing over.  

Mitosis cannot reduce the chromosome number to half in the sperms and eggs. Absence of crossing over in mitosis leads to the formation of genetically identical progeny cells from mitosis.  

Hence, mitosis can not form sperms and egg cells.  If it does, the sperms and egg cells would not have genetic variations and there would be doubling of chromosome number with each round of sexual reproduction.

8 0
3 years ago
The picture illustrates three cross sections of rock layers from three different areas.
amm1812

Answer:

hii can u PLZ put up the picture so that I can help u with this.Have a great day or night

7 0
3 years ago
If glucose is absent, but so is lactose, the lac operon will be ________.
umka2103 [35]

Answer:

Activated

Explanation:

In the presence of lactose, and in the absence of glucose, lactose will bind to a protein called a "repressor," deactivating it. Through this, RNA polymerase has a free way to synthesize the mRNA that will give enzymes for lactose degradation.

7 0
3 years ago
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Answer:

A control variable is the variable in the experiment that does not change.

Explanation:

If you are testing how seeds grow in different types of water, and you add 1tbps of salt to one pot of water with the plant, and then added 2tbps to another pot of water with the plant. The control variable in this experiment would be the water with no salt because it was not altered.

FYI I did not pull from google. Good luck!

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What is the relation between chromatin and chromosomes
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