Animals are heterotrophs/ autotrophs

Which of the following examples can cause gene flow between populations? a. an increase in predators to a population of zebra b. a volcanic eruption that kills half of a population of mice c. bird droppings that contain seeds from a different location d. a person that sprays a toxin on a group of mosquitoes

This is one form of rna that transports a specific amino acid to a ribosome during protein synthesis.

Several billion years ago which gas was the least prevailant in the atmosphere