Answer:
One possible cause of persistent sadness could be depression
Explanation:
Nerve cells, Blood cells, Reproductive cells, Skin cells
I believe the answer is C. E. And F.
Answer: They can be either of the same species (intraspecific interactions), or of different species (interspecific interactions). These effects may be short-term, like pollination and predation, or long-term; both often strongly influence the evolution of the species involved. A long-term interaction is called a symbiosis.
Explanation:
Answer:
I think answer is
-the waves transfer energy