1 The first life-forms to appear on Earth were most likely
(1) complex single-celled organisms
(2) complex multicellular organisms
(3) simple single-celled organisms
(4) simple multicellular organisms
2 One explanation for the variety of organisms present on Earth
today is that over
(1) new species have adapted to fill available niches in the environment
(2) evolution has caused the appearance of organisms that are similar to
(3) each niche has changed to support a certain variety of organism
(4) the environment has remained unchanged, causing rapid evolution
3 Which statement best explains the significance of meiosis in the process
of evolution within a species?
(1) The gametes produced by meiosis ensure the continuation of
any particular species by asexual reproduction.
(2) Equal numbers of eggs and sperm are produced by meiosis.
(3) Meiosis produces eggs and sperm that are alike.
(4) Meiosis provides for variation in the gametes produced by an
1 members of the original population of
bacteria that were penicillin resistant
survived and reproduced, creating a more
2 the bacteria that survived exposure to penicillin learned to
3 the bacteria that caused the new outbreaks were from populations
had never been exposed to penicillin
4 during each generation, the bacteria modified their own DNA to
increase their ability to resist penicillin and passed this
ability on to their descendants
5 Which statement about the rates of evolution for different
in agreement with the theory of evolution?
1 They are identical, since the species
live on the same planet.
2 They are identical, since each species is at risk of
3 They are different, since each species has different
adaptations that function
within a changing environment.
4 They are different, since each species has access to
resources within its