In most primate species, males rarely participate in _________.
A. infant care
B. breeding
C. hunting
D. establishing dominance.
Answer: A. infant care
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The zona pellucida is
A) a protective layer around the secondary oocyte. B) a protective layer around the sperm. C) a bump on the head of a sperm that contains enzymes. D) the biggest constriction of a chromosome.
Cores of coral reefs show a reef base that is well below the photic zone. How are two ways that is this possible, given the light limitations of reef-forming corals?
What will be an ideal response?
Refer to Figure 51-3. The amnion is identified by number:a
1. b. 2. c. 3. d. 4. e. 5.
The freshwater leech is an organism that feeds off of the blood of other organisms such as frogs and turtles. Which interaction describes the relationship between freshwater leeches and frogs or turtles?
A) herbivory B) predation C) mutualism D) parasitism