During male ejaculation, the internal urethral sphincter closes tightly to
A) prevent urine from leaking into the urethra.
B) isolate the ureters from the urinary bladder.
C) block movement of mucus from the bulbourethral gland into the ejaculatory duct.
D) keep sperm from moving into the ductus deferens.
E) allow seminal vesicle to transfer sperm to the epididymis.
A
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The individualistic view of communities proposed by ____ is supported by data showing that species compositions
change gradually across environmental gradients.
a. Clements b. Gleason c. Darwin d. Whitaker e. Connell
During parturition, mechanical pressure caused by the movement of the fetus through the uterus causes the release of
____ from the ____.
a. HCG; hypothalamus b. oxytocin; posterior pituitary c. oxytocin; hypothalamus d. HCG; posterior pituitary e. oxytocin; adrenal cortex
The higher the pH the more __________ the environment.
acidic neutral alkaline hypotonic
The oomycete that nearly destroyed the French wine industry in the late 1870s was
A) a cercozoan. B) a slime mold. C) red tide. D) a water mold. E) a protozoan.