Answer;
A bottleneck effect
Explanation;
When only a few individuals survive unfavorable times, thereby losing the majority of genotypes in the next generation, it is called a bottleneck effect.
It occurs when there is a disaster of some sort that reduces a population to a small handful, which rarely represents the actual genetic makeup of the initial population.
A red blood cell's function is to transport oxygen.
Cladistics is based on the shared characteristics between organisms and their network of evolutionary relationships
An organ is a group of tissues working together to perform specific functions. An example of an organ is the heart.