What type of stimulus is an allergen such as pollen?

response to a stimulus

external stimulus

internal stimulus

inborn stimulus

The correct answer is B. external stimulus

I did the test too XD Hope you do well!! ^w^

amber has allowed scientists to study dna that has been preserved over millions of years.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.