____________ shows that the building blocks of life form naturally under a wide range of circumstances
a. The Miller-Urey experiment
b. The Chicxulub event
c. The earliest fossils
d. The Drake equation
e. Stromatolites
a
Biology & Microbiology
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Which of the following are the water conducting cells of the xylem?
A. tracheids and parenchyma B. vessels and parenchyma C. sieve tubes and tracheids D. vessels and tracheids E. parenchyma and sieve tubes
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If the DNA in a cell consists of 20% A, it will be G.
A. 20% B. 30% C. 10% D. 80% E. 40%
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_____ are the main male hormones.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
A passageway shared by the digestive and respiratory systems is the ________
A) larynx B) pharynx C) sinuses D) esophagus
Biology & Microbiology