Answer:
Is the variation in the ecosystems found in a region or the variation in ecosystems over the whole planet.
Explanation:
To prevent blood flowing back after each heartbeat. They ensure that the blood flows only in one direction (back to the heart).
<span>Microevolution refers to changes in the genetic pool
of a species population. The changes in the genes (probably gene and allele frequencies)
are observed over short time periods hence are small changes. This is in comparison
to macroevolution that observes huge changes over longer time periods in the population that warrant that the new populations
is considered to be a new species</span>
B , because there is more than one path of energy coming from the plants but if it’s not B then it’s A because arrows that are all over the place is what makes it a web
