The majority of species require <u>oxygen</u> to survive
If you are doing this for edgen.uity the answer is all the above
You added your question in the wrong category, this is actually algebra lol.
Answer:
Each cell expresses, or turns on, only a fraction of its genes. The rest of the genes are repressed, or turned off. The process of turning genes on and off is known as gene regulation. ... Gene regulation also allows cells to react quickly to changes in their environments.
