8 Which best illustrates the relationship between variations within a population and natural selec-
tion?
A Natural selection acts upon a population since
all members of the population are identical.
B Organisms are able to change their genetic
makeup to best adapt to a changing external
environment.
C Giraffes have long necks and legs from
stretching to reach food in trees. This trait was
then passed to their offspring.
D Antelopes with muscular legs are able to
outrun their predators better than antelopes
with poor muscle tone. Thus they lived to
reproduce.

Which series lists the correct order of steps of binary fission from first to last? sex pilus connects two cells ® plasmid dna is transferred ® complementary dna strands are created ® cells separate live cells bind to degraded cells ® dna is transported across the membrane ® dna is incorporated into recipient's dna virus infects bacterial cell, new viruses are made ® dna is assembled in new virus ® new virus infects another bacterial cell and transfers dna dna is copied ® dna molecules attach to cell membrane ® cell membrane elongates and pinches off ® two identical cells are produced