Why do you think the puppy litter was all dark-haired?

Because dark hair is represented by a pair of dominant alleles.

Explanation:

Allele genes are segments of DNA (deoxyribonucleic acid) made up of pairs. One is from the mother (egg) and the other from the father (sperm), which are found at the same locus on homologous chromosomes. They are classified into:

The dominant genes are those that determine an inherited trait even when in a simple dose in the genotype. That is, they determine their character even in the absence of another dominant allele. In short, when the offspring receives at least one dominant allele, they will express that trait. In the case of the question above, black hair is a characteristic represented by the dominant allele, if all the offspring expressed this characteristic it is because everyone has at least one copy of that allele.

answer; //the above statement is (false);

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.