Which structural organizations are always present in proteins? A- Primary and Secondary B- Secondary and Tertiary C- Tertiary and Quaternary D- Primary and Tertiary

A. Primary and Secondary

Explanation:

This is because these are the two most basic and lowest levels of structural organization in proteins and therefore shared amongst all proteins. Primary structure is simply a chain of amino acids, secondary structure is either an alpha-helix or a beta-pleated (accordion) sheat formed by hydrogen bonds between the backbones of the primary structure protein, tertiary is just a 3d shape formed by the interactions of R groups of the amino acids, and quarternary is still 3d but made up of 1 or more sub 3-d shapes.

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.