Answer: the correct answer is d. all of the above must happen for defecation to occur.
Explanation:
In response to the distention of the rectal wall, the receptors send sensory nerve impulses to the sacral spinal cord. Motor impulses from the cord travel along parasympathetic nerves back to the descending colon, sigmoid colon, rectum, and anus. The resulting contraction of the longitudinal rectal muscles shortens the rectum, thereby increasing the pressure within it. This then opens the internal sphincter.
Cellular reproduction in a plant is asexual, the cell makes a copy of itself. I think the process is called Mitosis.
Answer:
proteins
Explanation:
- proteins help the cells grow
-proteins are also considered to serve as a source of energy
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Overproduction, Variation, Selection and COMPETITION.
