They are further classified into: fish, amphibians, birds, reptiles and mammals.
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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:
Merkel cells located in the epidermis.
- It is called sensory function.
- The Merkel cells send information to the brain about temperature and touch.
- After brain decode that we can feel it.
Hormones are chemical substances that affect the activity of another part of the body. Hormones serve as messengers, controlling and coordinating activities throughout the body.
The endocrine gland produces hormones.
