Compare the productivity of terrestrial and aquatic ecosystems against the percent of Earth’s surface area they occupy.

d

explanation:

the higher the instrument the better

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands