The pollutants in 1970 were the highest since recorded history and are declining steadily.
I believe it is B. Hope this helps!!
Answer:
Explanation:
Protozoa and helminths are two major groups of organisms acting as parasites and are able to cause various infections to humans. In definition, parasites are the organisms that live in or on other organisms (called host), and are capable of damaging the host. This biological relationship or the phenomenon is known as parasitism
Answer:
the cell membrane is selectively permeable
Explanation:
hope that helped
