Must be able to breed and produce fertile offspring
<span>Embryo means "an unborn or unhatched offspring in the process of development, in particular a human offspring during the period from approximately the second to the eighth week after fertilization (after which it is usually termed a fetus)."</span>
A. advancements of existing deserts
A hypothesis is a testable explanation of a scientific problem that is based on research and observation.
Cardiac muscles is the answer
