Before testing for starch, the leaf is warmed in ethanol. the ethanol turns green. why is this?

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons