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In most animals, the sperm and egg contribute an equal ____ to the zygote.
Q2: very dry, with extremes of heat and
Q15: The structure labeled 3 in Figure 51-2
Q19: Freshwater fishes excrete most of their nitrogenous
Q40: The organisms occupying the base of a
Q46: Each villus contains a lacteal, which functions
Q47: The walls of the descending limb of
Q50: the sigmoid colon is located here
Q53: tropical grassland
Q57: The exact elevation at which the treeline
Q71: Which of the following processes plays an