Sea urchins are preyed about by many predators that inhabit their marine environment, but also those animals that don't. The main predators of the sea urchin are crabs, large fish, sea otters, eels, birds and humans.
Interphase is the phase during which the growth of the cells take place along with the metabolic activity but the nuclear division in the cell does not occur. The three stages included within the interphase are the G1, S and G2.
Large carbohydrates consist of small monomers called monosaccharides. All carbohydrates are composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio. Proteins are composed of monomers called amino acids. Amino acids are composed of nitrogen, carbon, hydrogen, and oxygen.