Answer:
External stimulus is the type of stimulus an allergen, such as pollen, is classified.
Explanation:
I think is correct answer is B. Weathering.
Because the weathering is surface processes that work to break down to the rock.
Hope it helped
Answer
<u>Lungs</u> - "The human body posses to similar structures for inhalations and exhalation of air in the body". As lungs are in a pair and has the capacity of about 5 liters in total".
When the lungs face cold or humid air they operate as follows.
Explanation:
<u> Releasing Histamine</u>
lungs when faces cold air it release the chemical histamine in it so it can contract the soft muscle and contract the air ways.
<u> Humidifying the air</u>
As the human body has an inbuilt system to humidify the air up to 100 percent and 96' F in temperature for better operation.
False
plant cells and animal cells do not possess the same organelles.
For example plant cells have a cell wall while animal cells lack one