Question
One theory proposes that the evolution of facial muscles, and therefore facial expression, was a response to the emergence of this process. For 10 points each:
[10h] Name this process that, in one theory, first evolved to maintain the moisture of parchment-shelled eggs. In other animals, the emergence of this process also led to diphyodonty, the ability to grow two successive sets of teeth.
ANSWER: lactation [or milk production; accept breastfeeding; accept nursing; accept suckling]
[10e] The ability to lactate and grow hair are defining traits of this animal class containing monotremes, marsupials, and placentals.
ANSWER: mammals [or Mammalia]
[10m] In a namesake “bottleneck hypothesis,” the emergence of hair and whiskers led mammals to evolve this behavior in order to sense and avoid dinosaurs. Animals with this trait have the tapetum lucidum that induces eyeshine.
ANSWER: nocturnality
<Science - Biology>
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