During mating season, male sheep produce hormones that make them aggressive. this is an effect.

Activational effect

Explanation:

Sex hormones are the hormones involved in regulation of sexual activity and development of secondary sexual characters in males and females at the time of puberty. Activational effect is one of the specific effect of sex hormones. The sex hormones target to stimulate the mating behavior in organisms. Hence, the male sheep produce male sex hormone during mating season to increase its sexual activity.

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.