If a set of genes is induced in the presence of the controlling substance, it is referred to as ________ control.
Fill in the blank(s) with the appropriate word(s).
positive
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The water vascular system is not involved with: a. gas exchange
b. excretion. c. locomotion. d. sensing of light.
Why might predators take more time to recover following a disturbance than herbivores or producers?
a. Recovery time is based on the flow of energy, so herbivores recover first, then producers, and then predators b. Recovery time is based on the flow of energy, so producers recover first, then herbivores and finally predators. c. Recovery time is based on solar cycles, and thus predators are the second group to recover. d. Predators actually recover more quickly than others because of their mobility.
The number of currently described species on the planet is about ________.
a) 17,000 b) 150,000 c) 1.5 million d) 10 million
Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?
A. chloramines B. fluorine C. sodium iodide D. quaternary ammonium compounds E. hydrogen peroxide