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KatRina [158]
3 years ago
10

Most living things need oxygen to survive. These two body systems bring oxygen into your body and then move to all your body par

ts. What are these two body systems?
A) respiratory and muscular
B) digestive and circulatory
C) respiratory and digestive
D) circulatory and respiratory
Biology
2 answers:
Vikki [24]3 years ago
5 0
A is the answer i believe
Grace [21]3 years ago
3 0
Respiratory and digestive 
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<h3>Why does a virus lethal to us not infect animals?</h3>

For a virus to be able to enter a cell, it must have the right key. And this key, which are the proteins on the surface of viruses, has to enter the correct lock, the receptors that are on the cell membrane. Cells are actually houses with many different doors and locks. Some viruses have keys that open the lock of any cell and any kind of host, and others do not, so the infection caused by viruses is specific.

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3 years ago
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