Testosterone is an example of a chemical signal that affects the cells that synthesize it, the neighboring cells in the testis, along with distant cells outside of the testis. Thus testrosterone is an example of .
I. an autocrine signal
II. a paracrine signal
III. an endocrine signal
A. only I and II
B. only II and III
C. only I and III
D. I, II, and III

The correct answer is "b"

Asking a questionforming a hypothesisdesigning/carrying out one or more experimentsmaking observationsdrawing a conclusionhope this

Hmm this is a hard heterotroph's can't produce its own food. a human can produce it's own food because people kill animals and eat them like squirrel, deer, oak trees need rain which they don't produce the rain, bee's need flowers and pollen and nectar but they don't produce it either, rabbit's don't produce either, because they either steal carrots from your garden and eat leaves.so, the best answer that i would pick is a. humanshope my answer has you and sorry if it doesn't : ) : (

Answer catch-all kingdom;