In 2006, scientists discovered a fossil that had scales and gills, a flat head with eyes on top like a crocodile, and fin and neck bones that would allow it to prop itself out of the water. The best explanation for this fossil is that it is 

A. a transitional fossil between fish and amphibians.
B. a transitional fossil between amphibians and reptiles.
C. a ray-finned fish.
D. a modern amphibian.


A. a transitional fossil between fish and amphibians.

Biology & Microbiology

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Since insects do not have blood or a closed circulatory system that needs to be filtered of waste, what do they have instead?

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Four of the five factors listed below are limits to

achieving a population’s full biotic potential. Select the exception. a. lack of nutrients b. predation c. exponential growth d. competition for space e. waste buildup

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Where is the majority of DNA located in a human cell?

A. nucleus B. mitochondrion C. chloroplast D. ribosome

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A karyotype reveals that an individual is XYY. Based on your knowledge of human genetics you

correctly conclude that this individual is phenotypically __________ and __________. a. female; with criminal tendencies b. female; sterile c. female; fertile d. male; sterile e. male; fertile

Biology & Microbiology