The leaves of ginkgo trees are unique because they have
A. forked veins.
B. veins in a netlike pattern.
C. multiply branching veins.
D. veins only around the edges.
E. unbranched veins.
Answer: A
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Histamines
a. are produced by phagocytes to cause mucous production. b. are produced by mast cells to cause prostaglandin production. c. are produced by complement to attract phagocytes. d. are produced by mast cells to cause capillary dilation. e. are produced by complement to cause capillary constriction.
Humans have more DNA and more genes than any other organism
Indicate whether the statement is true or false
What is the process in which one activated receptor can give rise to thousands of
final products? a. signal transcription
b. signal transmission c. signal transduction d. signal termination e. signal amplification
Species that exhibit an equilibrial life history typically ________
A) have long lives B) exhibit a Type III survivorship curve C) exhibit a Type II survivorship curve D) have a large number of offspring