Ok i have a few questions but their generally easy its quite a few points its an overdue assignment so please answer quickly ;-; Which example is an internal stimulus?

an artificial light that attracts insects
a decrease in oxygen levels in the blood during exercise
a sudden change of air temperature
an increase in the amount of water available to a plant

What is one example of a response?

water lost from the lungs during breathing
outside temperature dropping at night
the angle of the sun changing during the day
ivy growing around the pole of a fence

What type of stimulus is an allergen such as pollen?

internal stimulus
inborn stimulus
response to a stimulus
external stimulus

Item 5
What is the stimulus shown in the photograph?

the trap closing over the insect
the insect touching the trigger hairs
the plant growing toward the light
light coming from a single direction