Answer:
C: Hormones
Explanation:
hormones do not "signal" other cells. I hope this helps :)
Echinoderms are marine invertebrates. They include sea stars, sand dollars, and feather stars. They have a spiny endoskeleton.
Chordates include vertebrates and invertebrates that have a notochord.
Answer:
cell theory states that: all living things are composed of one or more cells, the cell is the basic unit of life, and new cells arise from existing cells.
I hope this helps :)
Answer:
A. It is the most massive part of the atom.
