At the end of interphase each chromosome is made up of A. duplex chromatids. B. paired chromatids. C. sister chromatids. D. mother-daughter chromatids. E. brother-sister chromatids.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

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water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.

the species living around the vents are especially good at dispersal.  

deep-sea vent originates on the floor of the ocean when seawater circulates through hot volcanic rocks, usually situated where the new oceanic crust is being produced.  

biological dispersal refers to the movement of species from their location of birth to their site of breeding, or from breeding site to another. similarly, the oceanic dispersal refers to the movement of the species from one land mass to another by sea crossing.