Blue-green algae have been notified by scientist to produce ethanol, a biofuel. Why are the blue-green algae able to perform this function? A. because they were placed in nutrient-rich soil
B. because they were treated with antibiotics
C. because they were given artificial sunlight
D. because they were genetically engineered

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.