Several human disorders are the result of abnormalities in chromosome number. The most common are trisomies of chromosome numbers________ ,________ , or _________ , or abnormalities in the number of sex chromosomes.
Fill in the blank(s) with the appropriate word(s).
21,13,18
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Which of the following is true with regard to the carbon cycle? (Select all that apply.)
A. Animals are always sinks for CO2. B. Plants are always sinks for CO2. C. Cellular respiration releases CO2 into the environment. D. Photosynthesis removes CO2 from the environment. E. Plants are permanent sinks for CO2. F. Fossil fuels are stores of CO2. G. The ocean is both a source and a sink of CO2. H. Humans only contribute to the carbon cycle by the burning of fossil fuels.
White, narrow-tubular, highly fragrant flowers are most likely pollinated by
a. moths. b. butterflies. c. hummingbirds. d. bees. e. flies.
In the above diagram, the ____ is (are) labeled
with the letter "E".
a. esophagus b. larynx c. trachea d. epiglottis e. bronchi
You notice that in your aquarium, previously full of undoubtedly male fish, one is laying eggs. Upon a bit of research, you find out that the species of fish you purchased is a sequential hermaphrodite. Which of the following is true?
A. One of the male fish fertilized its own eggs. B. Since the fish are hermaphrodites, one of the male fish laid eggs and another will likely fertilize them. C. One of the male fish underwent protandry and became a female. D. The fish have protogyny, which allows the males to lay eggs. E. The fish have parthenogenesis, therefore their eggs do not have to be fertilized to be viable.