How did researchers explain the smaller size of sexual maturity for guppies in some Trinidad ...

How did researchers explain the smaller size of sexual maturity for guppies in some Trinidad streams?
 
  a. Some low-quality streams have small carrying capacities, which forces guppies to reach sexual maturity more quickly.
 b. Smaller streams require that individual fish be smaller at sexual maturity.
 c. Smaller sexually mature guppies were those that had hybridized with killifish, another small fish found in Trinidad.
 d. When predators select larger fish, the smaller fish reaching sexual maturity will experience increased fitness.

Question 2

________ is the process of losing heat into space from a warm object.
 
  a. Evaporation
 b. None of these choices.
 c. Convection
 d. Conduction
 e. Thermal radiation