Sympatric speciation is more common in plants than in animals.

A valid clade consists of an ancestor species and all its descendants.

The Kiabab squirrel lives on the north side of the Grand Canyon and the Albert squirrel lives on the south side.  Even though these two populations are only miles apart, their gene pools are kept isolated by

Boa constrictors have tiny pelvic girdles and leg bones within their bodies.  Since these structures are nonfunctional, they are called

Nucleotides and amino acids bound in a lipid-like surrounding describes

All of the following statements are inferences of natural selection except

Sympatric speciation requires geographic separation.

A population has a frequency of the “r” allele = 0.3.  What is the expected frequency of the “r” allele in the next generation assuming the population meets the criteria for Hardy-Weinberg?

Which of the following best describes speciation that occurs suddenly following a period of no change.

Which of the following biomes has permafrost; small mammals; cold temperatures?