The answer to this question would be: frequency
The higher intensity of the stimulus, the higher frequency of the action potential will be sent. The nerve can't send a higher action potential, so it firing at higher at higher intensity instead. So when you felt an intense pain, that means the pain receptor is firing more stimulus per second compared to low or mild pain.
An empidemic because it kills more people than we can count
Answer: A
Fungi are heterotrophic (decomposers) and are often mistaken as a plant because its rooted in the soil. But what also makes them different from plants is that fungi don't do photosynthesis and not all fungi are multicellular.