For coral reefs to form in tropical waters, it is necessary for the coral animals to live in symbiosis with:a
bacteria.
b. parrot fish.
c. zooxanthellae.
d. sea urchins.
e. kelp.
C
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Menstrual flow results in the discharge of ____
a. the follicle b. the corpus luteum
c. the lining of the uterus d. surface cells from the vagina e. blood from the blood vessels on the outer surface of the uterus
Which stage(s) show(s) the diploid portion of
the life cycle? a. A b. B c. C d. D e. D and E
Which of the following causes heartburn?
a. the pyloric sphincter remaining too tightly closed b. the gastroesophageal sphincter remaining a little open c. the pyloric sphincter remaining a little open d. the gastroesophageal sphincter remaining too tightly closed
Which of the following principles associated with the theory of island biogeography can be helpful to individuals designing parks and reserves?
A) the Hardy-Weinberg law B) the species-area relationship C) the polygyny threshold D) the Red Queen hypothesis E) none of the above