It can take up to __________ days after marijuana
use before the urine tests negative for the drug.
a. 3
b. 5
c. 7
d. 10
e. 14
Answer: d
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Which of the following is true concerning the life cycle of a moss?
a. Gametophytes are nutritionally dependent upon sporophytes. b. Emerging gametophytes arise from germinated spores. c. The zygote is protected within specialized tissues of the sporophyte. d. Spores are produced within reproductive bodies called antheridia.
The appendix is a vestigial structure that extends off of the ____
a. cecum b. colon c. duodenum d. rectum e. stomach
12C, 13C, and 14C are all isotopes of carbon. They differ in their
a. overall charges. b. number of electrons. c. number of protons. d. number of neutrons. e. electron energy shells.
Answer the following questions in reference to the five divisions of vascular plants listed below.
A. The giant club mosses of the Carboniferous period were members of this group. B. In members of this group the gametophyte is the dominant generation. C. Orchids are members of this division. D. Members of this group are heterosporous with well-developed seed and pollen-bearing cones. E. Members of this group include kidney beans, apples, and almonds.