I believe this is the cell wall
I think A. But not purposeful, purposelessness is correct answer
Answer:
living things interact with each other
When your body temperature rises because of an infection, it's called a fever<span>. </span>Fevers<span> are caused by chemicals called pyrogens flowing in the bloodstream. Pyrogens make their way to the hypothalamus in the brain, which is in charge of regulating body temperature.</span>
No, not all genes are constantly expressed. Genes are turned on and off depending on the specialty of the cells.
