The answer is D: A gradual change in a species over time.
The basic difference between them is that Earthworms are segmented invertebrates belonging to the phylum Annelida, Tapeworms are flatworms belonging to the phylum Platyhelminthes, and Roundworms are parasitic worms belonging to the phylum Nematoda.
Is this biology class? Lol
<span>The study of the interactions between living things and their environment is called ecology.</span>
Answer:
True
Explanation:
When an environment with a lot of ice such as a mountainous place or Antarctica, global warming can cause the ice to melt. This new water has to flow somewhere, most likely to the nearest body of water like the seas.
Answer:
The correct answer is b. must be present in a population before natural selection can act upon the population
Explanation:
Genetic variation can be caused by mutation, recombination between chromosomes during meiosis and by fusion of two genetically different gametes during sexual reproduction.
This genetic variation is necessary for the evolution of any population. Natural selection acts on every individual and it decreases the frequency of those alleles that are not suited for the environment and increase the frequency of those alleles which helps the individual to survive in the changing environment.
Therefore genetic variation must be present in the population before natural selection act on the.