Sickle cell anemia is caused by a recessive allele. A person must have a recessive allele from each parent to have the disease. A person who is heterozygous for sickle cell anemia does not have the disease. In
addition, this person is protected against malaria. Malaria is a disease that is common in countries in
Africa where people are more likely to have sickle cell anemia. A person who is heterozygous for sickle
cell anemia is somehow protected from malaria.
Assume that S represents the normal allele and that s represents the allele 2 points
for sickle cell anemia. What is the genotype for a person who is
heterozygous for sickle cell anemia?

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.  

its temperature is increasing. this causes molecular vibrations to increase.