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.
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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?
a. water b. hemolymph c. cytoplasm d. They have no body fluid.
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
Where is the majority of DNA located in a human cell?
A. nucleus B. mitochondrion C. chloroplast D. ribosome
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