WILL GIVE BRAINLIEST Amino acids have a common basic structure that includes four parts. Three of the parts are a central alpha carbon, a carboxyl group, and a hydrogen atom. What is the fourth part? A. oxygen B. nitrogen C. amino group D. side chain E. central oxygen

Which challenges do countries face in limiting the spread of communicable diseases? check all that apply. 1. lack of vaccinations 2. lack of healthy food available 3. increase of worldwide travel 4. decrease of available clean water 5. increase in migration of infected animals

What else happens in your cardiovascular system in response to your sympathetic nervous system? why might your blood vessels need to expand to accommodate this?

Peter's doctor calculated his body mass index (bmi) and determined that his fat-to-lean tissue ratio was a bit too high. which of the following should peter increase in his weekly schedule to specifically address this issue?