What is the most likely reason that horses and mountain goats have hooves?
a. they have homologous structures because they have a common ancestor.
b. they have analogous structures because they have a common ancestor.
c. these are vestigial structures in both animals because they are not used.
d. these are similar structures due genetic mutations.

The correct answer is statement a.

Explanation:

The prevalence of shared ancestry between the genes or a pair of structures in different taxa is termed as homology. A common illustration of homologous structures is the forelimbs of vertebrates. A homologous structure refers to a bone or an organ that possess similar underlying anatomical characteristics, which is witnessed in various animals. These compositions hold the notion that distinct animals originated from a common ancestor and serve as the proof of evolution.

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.