Beach grass colonizing newly formed sand dunes is
A) primary succession.
B) secondary succession.
C) chronosequence.
D) autogenic change.
A
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Which of the following is true regarding anabolic steroids?
A. Anabolic steroids were first developed by pharmaceutical companies in the late 1800s for the treatment of diseases associated with muscle wasting. B. Anabolic steroids are developed from estrogen, the female sex hormone. C. Because the use of anabolic steroids is illegal without a prescription, the purchase of these compounds has decreased over the past twenty years. D. Anabolic steroids have been found to cause few side effects and do not pose a serious health risk. E. Anabolic steroids increase muscle mass and are thought to help improve athletic performance.
What is a sensory receptor?
A. a nerve cell specialized to detect particular stimuli B. a membrane protein the binds to a sensory ligand C. the dendritic field of a sensory neuron D. a specialized tissue like the eye
The genetic code was deciphered
A) in the year 2000, following several years of the human genome project. B) in the 1980s, as many Mendelian diseases had their genes identified. C) in the 1960s. D) in the 1950s.
Human gametes are produced by ______.
Fill in the blank(s) with the appropriate word(s).