Much of the world's coal reserves were formed from the buried remains of the dominant plants of the Carboniferous period. What were the dominant plants of the period?
a. gymnosperms and angiosperms
b. angiosperms only
c. gymnosperms only
d. seedless vascular plants
Ans: d. seedless vascular plants
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Finches have lived in Hawaii for:a
1000 years. b. 100 000 years. c. 4 million years. d. 5 million years. e. 63 million years.
Joseph Lister ________.
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The following is a list of events involved in the activation of a cell by a steroid hormone. Which one of the following answers best represents the order in which the steps occur?
1. cellular response to the hormone 2. activation of a gene 3. formation of a hormone-receptor complex 4. diffusion of the hormone through a target cell membrane 5. production of a protein A) 4, 3, 2, 5, 1 B) 2, 5, 4, 3, 1 C) 5, 3, 4, 1, 2 D) 2, 5, 1, 3, 4 E) 4, 3, 2, 1, 5