Which statement describes the chemical released by the coral and explains its effect is region 12
O The chemical is a pheromone that attracts nearby goby fish so that they can reproduce.
O The chemical is a toxin that causes goby fish to swim away from the region.
O The chemical is a pheromone that attracts goby fish that eat the seaweed on the coral.
O The chemical is a toxin that is spread by the goby fish to kill the seaweed.

characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

c.           is the correct answer