Charles darwin observed the resemblance between organisms on the galápagos islands and those on the nearest coast. he hypothesized that the island organisms had evolved from the coastal organisms. what mechanism did darwin propose caused evolution?

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

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