8. Gamekeepers who hunted birds for leisure in the 1800s wanted a dog that didn't actually

exist, so they mated a mastiff and a bulldog to get the qualities that they wanted. Mastiffs were

big and strong. They were also good companions, but they lacked speed and aggression. The

bulldog however was aggressive and fast, but lacked in strength. Through mating, they

eventually produced a bullmastiff, which was large, quick, strong and aggressive.

This technique is known as

Selective breeding by controlled mating

Explanation:

This technique is used by scientists, breeders, and more. In order to study and breed selected types of animals/plants to get and bring out the ideal traits they're looking for as your statement said.

one would be wind another would be water density

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.