Answer is A. A population becomes separated by environmental factors into two groups that do not reproduce with one another.
When a population of a species become geographically separated then gene flow between them stops. Over a period of time, the population may become genetically different in response to the natural selection due to different environments. Selection and genetic drift will act differently on these two separated populations. This will results into two separate species. This type of speciation is called allopatric speciation.
Answer:
mutualism and parasitism
Examples:
mutualism: crocodiles and birds
parasitism: mosquitoes and humans
Cutaneous<span> receptor. The </span>cutaneous receptors<span> are the types of sensory receptor found in the dermis or epidermis. They are a part of the somatosensory system.</span>Cutaneous receptors<span> include </span>cutaneous<span> mechanoreceptors, nociceptors (pain) and thermoreceptors (temperature).</span>
