Why is it impossible for unicellular organisms to reproduce sexually

Describe speciation of the galapagos island finches in terms of geographic isolation

What percentage of light hits earth's surface directly?

Waianapanapa beach in hawaii is a black-sand beach that was formed by waves crashing against volcanic rock. the sand can be very hot on sunny days. which statement best explains why? o a. the black sand has no heat capacity. b. the black sand absorbs no radiation. o c. the black sand is immune to insolation. d. the black sand has a low albedo.