Which of the following is NOT part of an alternation of generations life cycle?
A. gametophyte generation
B. sporophyte generation
C. haploid spores
D. triploid gametes
E. a diploid zygote
Answer: D
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Earth's early atmosphere contained (select all that apply):
A. methane. B. water. C. nitrogen. D. hydrogen. E. organic molecules.
To meet the high oxygen demands of flight, birds _____
a. use simple lungs b. use air sacs connected to their lungs c. use carbon dioxide for respiration d. can diffuse oxygen through their skin e. use simple lungs, and can diffuse oxygen through their skin
_____ are suspensions of fine dust or moisture in the air that contain live pathogens, whereas droplets are dried microscopic residues ejected from the mouth and nose.
Fill in the blank(s) with the appropriate word(s).
Which of the following combinations of sex chromosomes results in Klinefelter syndrome?
A) XO B) XXX C) XYY D) XXY