Animal cells do not have cell walls because they do not need them. Cell walls, which are found in plant cells, maintain cell shape, almost as if each cell has its own exoskeleton.
A deadly water-borne microorganism in a city's water source.
Answer:
The correct option is <em>Genetic drift greatly affects small populations, but large populations can recover.</em>
Explanation:
Genetic drift is an evolutionary mechanism in which the allelic frequencies in a population change through many generations. Its effects are <u>harder in a small-sized population.</u>
Genetic drift results in some alleles loss, even those that are beneficial for the population, and the fixation of some other alleles by an increase in their frequencies. The final consequence is to randomly attach one of the alleles.
Genetic drift has important effects on a population when this last one reduces its size dramatically because of a disaster -bottleneck effect- or because of a population split -founder effect-.
In the exposed example, the hurricane caused a disaster in both populations, reducing the number of individuals on the island and in the mainland. Henry saw a decrease in genetic variation in the island species, but not in the mainland species. This could be because the island population was smaller than the mainland population, so it was more affected by the disaster. The loss of some alleles in the population caused a decrease in genetic variation in the island population.
It seems that you have missed the necessary options to answer this question, but anyway, here is the answer. The cell walls of bacteria contain the material PEPTIDOGLYCANS. This is the <span>substance forming the cell walls of many bacteria, consisting of glycosaminoglycan chains interlinked with short peptides. Hope this answer helps.</span>
Answer:
The cerebellum.
Explanation: The cerebellum, which is also known as the "little brain", is responsible for motor movement and coordination with those movements.
