In the graph above, which baby characteristics would explain the percent infant mortality curve and any subsequent effects on fitness?
A. The baby needs to be small enough to survive after birth, but large enough for a safe delivery.
B. The larger the baby the better the chance of survival.
C. The smaller the baby the better the chance of survival.
D. The baby needs to be large enough to survive after birth, but small enough for a safe delivery.
E. There is no correlation between birth weight and survival.
Answer: D
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