The principal organ of exchange between the mother and the developing organism is the placenta.
The answer is D.
Species diversity has been increasing through decades of years.
<span>Think of each amino acid like a different letter, there are only 26 letters but yet millions of words, it works the same sort of way. </span>
Answer:
B. An idea supported by evidence.
There should be more individuals with the dominant trait so the population is not in equilibrium.
