What is a biology? And what is learned?

In biology, students study a variety of life processes and learn how different organisms meet the challenges of living in their environment. Major biological concepts for student focus include homeostasis, energy transfer and use, the relationship between structure and function, and change over time.

Explanation:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's