Answer the following statements true (T) or false (F)

1. Two species of three-spined stickleback fish live in a single lake in British Columbia. They are closely related but occupy different niches. They exist nowhere else. These species most likely arose by sympatric speciation from a single species of three-spined stickleback.
2. The pace of evolution may change due to sudden environmental shifts such as climate change. This may result in rapid evolution.
3. The Mexican axolotl (Ambystoma mexicanum) is an amphibian that has a derived mode of development characterized by metamorphic failure. This mode of development results in an entirely aquatic life cycle in which the animal never develops a terrestrial phase. This is an example of paedomorphosis.
4. A modern goal of systematics is to create taxa based on similarity of form and function, regardless of evolutionary relationships.
5. An assumption used for molecular clocks is that neutral mutations accumulate at a rapidly increasing rate over time between two species.


1. TRUE
2. TRUE
3. TRUE
4. FALSE
5. FALSE

Biology & Microbiology

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Comparing the evolution of domesticated dogs to the evolution of wolves over the same time period illustrates what relationship between artificial and natural selection?   

A.  Artificial selection is slower than natural selection. B.  Artificial selection is reversible; natural selection is not. C.  Artificial selection is more likely to produce maladaptive structures than natural selection. D.  Artificial selection cannot produce changes as large as changes produced by natural selection. E.  In artificial selection, the magnitude of the selection pressure can be varied; in natural selection, it cannot.

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Light that is absorbed by water is converted to:

a. short wave radiation. b. long wave radiation. c. heat. d. mass. e. green light.

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Rotifers take their name from ____

a. their tumbling movements through the water b. actions of cilia on their head c. their radial symmetry d. their elaborate digestive system e. rotational action around the central body axis

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Which type of anatomical feature is a plant stem considered to be?

a. an organ b. a meristem c. a shoot system d. a tissue

Biology & Microbiology