When a cell releases chemicals that act as signals into the extracellular fluid to affect cells, this is an
example of
a. autocrine regulation.
b. endocrine regulation.
c. paracrine regulation.
d. systemic regulation.
e. exocrine regulation.
C
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Would you recommend a couple in which the male is infertile to seek genetic counseling? Why or why not?
What will be an ideal response?
Describe the process of double fertilization in flowering plants
What will be an ideal response?
Mammals descended from a group of reptiles known as:
a. eutherians. b. lancelets. c. therapsids. d. holothurians. e. labyrinthodonts.
In order for macromolecules to form, smaller molecules must be concentrated. All of the following have been proposed as ways for concentrating organic molecules EXCEPT?
A. Organic molecules could have collected on the surface of clay particles. B. Organic molecules could have been concentrated when they were trapped in small basins and the water evaporated. C. Organic molecules could have made copies of themselves and this resulted in concentrations of molecules. D. Organic molecules could have been concentrated when water froze.