Answer:
The correct answer is vasoconstriction has occurred.
Thermal receptors present in the skin sense the cold around the surrounding and stimulates the sympathetic nervous system of the body.
It immediately causes vasoconstriction in the skin, legs, and arms.
Vasoconstriction prevents or decrease the heat loss from the body to the environment.
Decreased flow of blood to the skin and extremities turns the skin pale in color.
Options for the questions are not given. They are as follows :
A ) 1,2,3
B) 2,3
C)1 ,3, 4
D)1
E) 1 through 4
Answer:
C) 1,3,4
Explanation:
Some aphids make black walnut trees their habitat in the forest and only prefer to mate with aphids who have the same habitat. This is an example of reproductive isolation since these aphids now have different mating preferences and hence are isolated from rest of the aphids. The isolation occurred on the basis of difference in habitats so it is also an example of habitat isolation. Since the mating is prevented all together it is also an example of prezygotic barrier i.e. formation of zygote is inhibited. However, it is not an example of allopatric speciation since the aphids are not separated geographically from each other. They are present in the same area but have different habitat preference. Hence, option C is correct answer.
When you cut your hand your body reacts to it as a stimulus
So stimulus
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