Viruses can multiply very quickly, and so they can go through natural selection at a much quicker rate, allowing certain vaccine resistant mutations to take over a population.
The answer is D as there are fluctuations which means that changes in the population of one affects the population of the other. as prey pop increases predator pop increases leading to a decease in prey pop which causes predator pop to decrease due to lack of food then prey increases and the cycle repeats
4 because if you have a infection it causes you not to breath properly
Annelids have neither an external or an internal shell. Examples of annelids are
earthworms and leeches.
Answer:
produced at one at a time.
Explanation:
human egg are not produced only at one time.
