Inside nitrogen-fixing nodules, one N2 molecule is converted into two
A. NH3.
B. N.
C. NO3.
D. NO.
E. NO2.
Answer: A
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Male mallards have had emerald green head
feathers and wings with metallic blue patches for hundreds of years, whereas female mallards have been drab, brown-feathered ducks. This phenotypic situation suggests that mallards may be an example of a. directional selection. b. polyploidy. c. allopatric speciation. d. disruptive selection. e. sexual selection.
Which of the following is not transported within the plant by the xylem and/or the phloem?
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A person with only one allele for a recessive condition who does not have the condition is called a ________
Fill in the blank(s) with correct word