<span>
Basically because your skin has several layers to it (see link, below), and the layer that has the blood vessels capable of bleeding in it is further down than a superficial scrape would affect.
</span>
Answer: B)The continents were once connected.
Explanation:
There was probably some kind of earth quake or drift in the plains/plates causing the land to break into pieces and separate
The correct answer is it decreases genetic diversity only by reducing population size.
<span>
The great explanation for this is a bottleneck effect, which is an extreme example of genetic drift. The bottleneck effect occurs when the size of a population is reduced due to a catastrophe. When it happens, only a small, random number of individuals survive the event and pass through the bottleneck. Thus, the genetic composition of the random survivors is now the genetic composition of the entire population which means that the genetic diversity is reduced.</span>
