Which of the following describes how vestigial structures provide evidence to support that life changes over time?
a. some animals exhibit similar structures, possibly due to a common ancestor
b. some animals exhibit similar stages of embryonic development
c. some animals exhibit structures that are no longer used for any purpose
d. some fossils exhibit similar biological proteins
! will give correct answers if possible.

i think its A. some animals exhibit similar structures, possibly due to a common ancestor

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.