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.
<h3><u>Answer;</u></h3>
Evolutionary patterns observed in the fossil record are consistent with evolutionary processes occurring today.
<h3><u>Explanation;</u></h3>
- Three spine stickleback is a model organisms for studies in evolution because; Stickleback fish are small and have short generation times. These two characteristics make them easy to keep in a lab and useful for conducting genetic studies, since researchers can follow several generations of fish in a relatively short time.
- Also, stickleback fish populations occur throughout the Northern Hemisphere in a wide range of environments, so researchers can compare different populations and study how they have changed over time in response to different environmental pressures.
48 because u have to look at it on the textbook
<span>Sea Grape, Coccoloba uvifera is a remarkable native, salttolerant</span><span>
species of plant found along many of Florida’s beaches.
Plants may appear as low spreading bushes or tall continuous
hedges along the sand dunes. This plant can be identified by its
thick circular leaves 8” to 10” in diameter and its grape-like
clusters of fruit. This fruit is consumed by a number of native
birds and mammals, while the protective canopy provides habitat
for animals including songbirds, lizards, gopher tortoise and</span>
