All living organisms are dependent upon plants because ____

a. plants produce carbon dioxide as a by-product of photosynthesis
b. as producers, they form the base of food chains
c. they function to prevent erosion and reduce desertification
d. they remove oxygen from the atmosphere
e. they contribute to the problems generated by the greenhouse effect


ANSWER: b

Biology & Microbiology

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The primary function of the endosperm is ____

a. protection b. reproduction c. growth d. nutrition e. water absorption

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Fish can control buoyancy by:

a. holding air in their lungs. b. expelling air from their lungs. c. facilitating swift operculum movement. d. adjusting the amount of gas in their swim bladders. e. inflating the chambers of their tracheae.

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Which of the following statements regarding an atom with high electronegativity is true?

a. It will have fewer protons than an atom with low electronegativity. b. It will have a tendency not to attract electrons. c. It will most likely be located on the left-most side of the periodic table of elements. d. None of these choices are correct. e. All of these choices are correct.

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Photosynthetic aquatic microorganisms, such as some bacteria and protists, are known as ________

Fill in the blank(s) with correct word

Biology & Microbiology