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.
ï§ Chromosome: Structure composed of a very long DNA molecule and associated proteins that carries part (or all) of the hereditary information of an organism ï§ Chromatin: Complex of DNA, histones, and nonhistone proteins found in the nucleus of a eukaryotic cell. The material of which chromosomes are made.