What is formed when atoms of elements combine?

a. compounds
b. electrons
c. protons
d. neutrons

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases

Which is a function of vascular tissue? a. to perform photosynthesis b. to transport water and nutrients c. to absorb minerals and sugar d. to interact with soil fungi

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart