Check all statements below that are true.

all organisms must compete for survival.

when organisms struggle to survive, they usually mutate to increase chances of reproduction.

some organisms have phenotypes that make them better competitors than others in their environment.

animals undergo natural selection, but plants and other organisms generally do not.

natural selection continues to occur even today.

phenotypes found in the most successful members of a species become the most prevalent after several generations.

a decrease in food availability will increase the variation in a population.

All organisms must compete for survival.

Natural selection continues to occur even today.

When organisms struggle to survive, they usually mutate to increase chances of

reproduction

A decrease in food availability will increase the variation in a population

Explanation:

According to Charles Darwin in his theory of natural selection, organisms must compete for scarce resources. Only the fittest can survive. The fittest are organisms that have undergone the required genetic changes that increases their chances of survival. They pass on these genetic changes to the next generation or offspring.

When availability of food decreases, organisms begin to change genetically as they struggle for scarce resources thereby leading to variation in a population.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.