The defining trait of hominins is ____
a. large brain
b. shoulder that can rotate 360 degrees
c. bipedalism
d. extended care of young
e. nails on fingers and toes
ANSWER: c
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More than ____ percent of couples decide to terminate a Down syndrome pregnancy
a. ten b. thirty c. fifty d. seventy e. ninety
When the theory of evolution by natural selection was first presented in 1858, authorship was credited to both Charles
Darwin and ____. a. Charles Lyell b. Alfred Wallace c. Georges Cuvier d. Jean-Baptiste Lamarck e. Thomas Malthus
__________ are tetrapods that live on land but typically return to water to reproduce. Fill in the blank(s) with the appropriate word(s)
For the amino acid glutamine, the three-letter abbreviation is ________ and the one-letter abbreviation is ________
Fill in the blank with correct word.