Are those considered theories?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?

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.

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity