A. social age
b. chronological age
c. psychological age
<span>d. biological age
Its D, biological age.</span>
Answer:
Vestigial structures do not have a function, yet they are homologous to functional structures in related species. They are important because they provide clues to the ancestry of the organism. Many species look similar as embryos.
Answer: stroke volume
Explanation:
Stroke volume is the amount of blood ejected during ventricular contraction or for each stroke of the heart.
Yes they contain a permanent vacuole
