Please help. answer the question below

I think it is temperature because that is a key to help growing kelp

its either co2 or o2

Explanation:

i cant remember specifics but i know for a fact water clarity and temperature isnt going to affect kelp. that thing wont die if u lit it on fire

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