The similarity of the embryos of chickens and humans is evidence of ________.
A. artificial selection
B. decreased genetic variation
C. genetic drift
D. common ancestry
D. common ancestry
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Why is eating carrots thought to be useful for enhancing vision?
A. High levels of chlorophyll in carrots helps with photosynthesis in the eyes. B. High levels of beta-carotene can lead to the production of a pigment used in vision. C. High levels of carotenoids in carrots can allow vertebrate eyes to perform the dark reactions. D. High levels of NADPH in carrots can allow vertebrate eyes to perform the light reactions.
Above zero degrees, the actual number of degrees Celsius for any given temperature is ____ the degrees Fahrenheit.
(a) higher than (b) lower than (c) the same as (d) a or b
The most detailed image of the surface of a cell would be found on a ____
a. light micrograph from a phase contrast microscope b. transmission electron micrograph c. scanning electron micrograph d. light micrograph from a light microscope e. transmission electron micrograph
What percent of plants are polyploids?
a. 20 b. 35 c. 50 d. 70 e. 90