1) A crocodiles leg, whales fin, and bats wing are all homologous structures. What does this mean?
they have similar sizes and functions
they prove that limbs of all land animals evolved from wings and fins
they have similar structures but different functions
they are no longer used by current organisms

2) Which of the following groups represents a population?

all wolves in Canada
the different species of spiders within an ecosystem
all of the meadowlarks found in North America
a group of raccoons living in a wildlife preserve

3) For natural selection to occur, three things much be true. Which of the following is NOT one of those?

one trait must be favorable to survive within the ecosystem
the trait must be resistant to mutations
the trait must be passed on to the next generation
there must be a variation within the traits of the population

4) Studying a the sediment layers in a rock formation, a biologist can assume that the organisms found in the upper layers

are exactly 3.2 million years older than an organism found 3.2 meters lower
are relatively older than those found in lower layers
are relatively younger than those found in lower layers
you cannot tell anything about the relative age of a fossil

5) After partially draining a pond, a small population of fish undergoes genetic drift where more of the striped fish died. Which of the following is a direct result of this genetic drift?

a new allele will take over the population
the recessive trait becomes dominant
there is a large change in the allele frequency of this trait
the Hardy-Weinberg equilibrium will no longer equal 1