PLS HELP WILL MARK BRAINLIEST Discuss the biological reaction of being tense and nervous and how this affects the body then talk about how this reaction affects communication. I. e. if you are shy what happens to voice and body language?

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

What are two reasons for why a species might disappear from the fossil record?

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?