Which organ system most likely helps you cool off when you're exercising? O A. The digestive system OB. The respiratory system OC. The circulatory system D. The excretory system

What are the steps of how energy is transformed in plant cells?

20 the compound al(nh3)2 has atoms of nitrogen.

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.