An event that restricts the size of a population such as weather events like drought or flood is likely a... *

answer; /// i do believe the correct answer is (

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

a and c are the answeres