<span>d. by sending and detecting chemical messages</span>
Try to study more next time
Geological change will not cause a mass extinction, because it happens on a too big scale - on the scale of millions of years. During such long time, it is more likely that other causes will influence the survival of extinction of species, such as climate change or environmental disasters, and even if there is a small influence, it would not be significant next to other causes.
awnser is high concentrations of oxygen
Answer:
i think b and c. but not sure what the third is? only 70% sure.
Explanation:
