Answer:
Vein
Explanation:
Veins are the ones that keep you alive because blood goes inside the vein
B. group of the same species that live together.
Its definitely not A, nor is it D because food webs and food chains can be either land or aquatic animals. i think its B because a food chain goes up and a food web includes more organisms
winds also B. because winds change the air pressure meaning thats the answer
The sum of all the genes in a population is referred to as the gene pool.
