D Streak. The student is scratching it on white paper to test the streak.
<span>All things that are found within the Earth are one way or another, composed of carbon. Carbon is very abundant within metals that are dug from the Earth and they can also be seen making up parts of the human body’s bones to make it light weight. Most scientists believe that throughout the evolution of Earth, carbon has always been present and makes up most of the materials that have existed before. </span>
Answer: a naturally occurring depsipeptide used in the transport of potassium
plutoids hope this helps :)
The immune system helps guard against infection, protect from UV radiation, and regulate body temperature.
