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Questions in biology

[Free] Scientists estimate that there may be up to ____________ species alive today. A. 30 billion B. 30 million C. 1.9 million D. 1.9 billion

[Free] List three pollutants that the burning of fossil fuels adds to the air. What are the sources of these three pollutants?

[Free] The type of protozoan that uses pseudopods (false feet) to move is: a. a ciliate protozoan. b. an amoeboid protozoan. c. a sporozoan. d. an alga.

[Free] In Mendel’s initial experiments, an example of the F2 generation would be: A. 75 round seed plants to 25 wrinkled seed plants B. 75 green seed plants to 25 yellow seed plants C. 75 white-flowered plants to 25 purple-flowered plants D. All of the above

[Free] If vascular plants have so many advantages, why do nonvascular plants still exist on Earth today?

[Free] Two long tubes of muscle that lead from the stomach and help absorb food are the _____ and the _________.

[Free] Skeletal muscles need a rich blood supply to provide them with A. oxygen. B. carbon dioxide. C. water. D. none of the above.

[Free] Which is an example of a predator-prey relationship? A. The relationship between a duck and a pond of water. B. The relationship between a lion and a zebra. C. The relationship between a bee and a flower. D. The relationship between a hen and a rooster.

[Free] What are the traits used to classify a virus?

[Free] The parts of a neuron include: a. the cell body. b. one axon. c. numerous dendrites. d. all of the above.