Which is an example of an internal stimulus?

a.
a sudden change of air temperature

b.
an artificial light that attracts insects

c.
an increase in the amount of water available to a plant

d.
a decrease in oxygen levels in the blood during exercise

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a