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.
Interphase. G0. Resting phase (also called the quiescent or dormant phase). 1  The cell performs all of its normal functions but is not preparing to divide. 2  Some cells divide often and either are in G 0 for a short amount of time or skip G 0. 3  Other cells do not divide very often and are in the G 0 phase for many years.