Which of the following statements is true about external and internal fertilization?

The answer is C.  External fertilization doesn't require sexual intercourse.

Explanation:

Fertilization is the process by which haploid gametes, sperm and egg, combine to produce new offspring.  

Based on the fusion of sperms and egg fertilization is divided into two types, Internal fertilization and external fertilization.  

Internal fertilization:

In internal fertilization the sperms are inserted into female reproductive system where they fuse with egg and zygote is formed.  

External fertilization :

In external fertilization, the sperms and egg fuse outside the female reproductive system. Mostly this type of fertilization is found in aquatic organisms like fish and amphibians. The female deposits her eggs at a place and then male ejects the sperms over eggs and then fusion take place.  

answer; polycythemia is the correct answer;

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.