Which of the following is a major influence on the direction of evolution (which organisms go extinct and which new ones evolve)? 

A. the environmental conditions a species encounters
B. the size of the Earth
C. mutations in the cells that do not form gametes
D. floods, tornados, earthquakes, and hurricanes


A. the environmental conditions a species encounters

Biology & Microbiology

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______ do NOT depend on the circulatory system to deliver oxygen to the tissues.

A. Insects B. Molluscs C. Mammals D. Birds E. Amphibians

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

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Which pathway is the foundation for the majority of ecosystems and food chains on Earth?

A) photosynthesis B) anaerobic respiration C) aerobic respiration D) chemosynthesis E) decomposition

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Which of the following can best be considered a biological system?

a. a pond b. the biosphere c. a single liver cell d. all of the listed responses are correct

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