The male reproductive whorl of a flower typically consists of one or more ____
a. petals
b. carpels
c. stamens
d. receptacles
e. sepals
ANSWER: c
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Which respiratory surface lacks physical protection from the external environment?
a. tracheal system tubes b. human lungs c. external gills d. internal gills e. bird lungs
Describe the positioning of heartwood versus sapwood
What will be an ideal response?
Three species of tigers have gone extinct due to overharvesting or habitat destruction. This is an example of
A. mass extinction. B. adaptive radiation. C. sympatric speciation. D. increased extinction rate by human activity. E. background extinction rate.
Which of the following groups of scientists were influential around the year 1900 in setting the stage for our present understanding of transmission genetics?
A) de Vries, Correns, Tschermak, Sutton, and Boveri B) Beadle, Tatum, and Lederberg C) Hippocrates, Aristotle, and Kölreuter D) Watson, Crick, Wilkins, and Franklin E) Darwin, Mendel, and Lamarck