Which one of these is not an example of inter-cellular communication? a.) chemical signal from pituitary gland to adrenal gland b.) a vesicle encloses over a nutrient molecule c.) chemical messengers dock onto receptors of adrenal gland d.) electrical signals pass between heart cells me i've been on this question for over an hour. i'm sure it's literally the simplest thing, but i'm not getting it. : (

Which organelle releases chemicals that break down large food particles into smaller ones?

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h, o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

What are the responsibilities of the region of the brain highlighted below? =+= will rate brainiest =+=