Which option describe a similarity and a difference between isotope and an element

Isotopes are chemical elements which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the equal no of protons but different numbers of neutrons.The total number of protons is called atomic number and is equal to the number of electrons in an atom. Each atomic number identifies a special element. An atom of a given element may have a wide range in its number of neutrons. The number of nucleons (both protons and neutrons) in the nucleus is nothing but the mass number, and each isotope of a given element has a different mass number.

Explanation:

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.