Question

27. How did the addition of oxygen to Earth's atmosphere affect the evolution of life?
Answer: Some organisms began to evolve more efficient metabolic pathways that used oxygen for respiration; others became restricted to oxygen-free habitats.

28. According to the endosymbiotic theory, how did mitochondria originate?
Answer: Mitochondria originated when a bacterial cell took up residence inside another cell about 2 billion years ago.

29. What part of Miller and Urey's apparatus represents rain? What important role would rain play in chemical evolution?
Answer: Miller and Urey's apparatus represents droplets that form when the gases pass the condensation chamber.

30. How do you think the cells that took in the ancestors of mitochondria and chloroplasts benefited from the relationship?
Answer: The cells that took in the ancestors of mitochondria and chloroplasts benefited from the relationship by gaining the ability to metabolize oxygen, and thereby, to live under the new Earth conditions.

31. Which fossils are probably older—those in layer A or those in layer C? How do you know?
Answer: Fossils in layer C are probably older. Layer C is buried more deeply than layer A.

32. Which rock layer in location 2 is probably about the same age as layer C in location 1? How do you know?
Answer: None of the rock layers in Location 2 are the same age as layer C in location 1

33. What are the characteristics of a useful index fossil?
Answer: Useful index fossils are easily identified and occur in only a few

Answer 1

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Answer 2

For #18) geological changes can occur and when they do, they can have a large impact on species that might not be largely populated. So let's say that a group of deer live on a mountain... and then all of a sudden, this mountain this mountain starts to lose its large elevation. The deer that have acclimated to the lower temperatures on those high elevations are now forced into an environment with different temperatures. They might not be well suited for the environment. In most cases, when this occurs and species have to change, this is called speciation and it is where a species will acclimate to a new environment due to natural selection over a long period of time. But if this species is small there is a high chance that they might not survive and reproduce, thus leading to extinction.

Answer 3

So all-in-all I would say that it is true