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

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2 One explanation for the variety of organisms present on Earth today is that over time

(1) new species have adapted to fill available niches in the environment
(2) evolution has caused the appearance of organisms that are similar to each other
(3) each niche has changed to support a certain variety of organism
(4) the environment has remained unchanged, causing rapid evolution

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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 organism 

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4 When the antibiotic penicillin was first introduced, it was immediately effective in combating staphylococcus bacterial infections. After a number of years, there were outbreaks of staphylococcal infections that did not respond to treatment with penicillin. The best explanation for this situation is that

1 members of the original population of bacteria that were penicillin resistant survived and reproduced, creating a more resistant population
2 the bacteria that survived exposure to penicillin learned to avoid it
3 the bacteria that caused the new outbreaks were from populations that 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

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5 Which statement about the rates of evolution for different species is 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 becoming extinct.
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 unlimited  resources within its environment.

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