Which of the following statements best justifies the use of the experimental results in an investigation of interspecies competition?
(A) When two populations use different sources of energy, one of the populations will thrivein a shared environment and the other will become extinct.
(B) When two populations use the same sources of energy, resource availability in a shared environment limits the growth of both populations.
(C) Because the change in entropy of a system containing two different species is always positive, populations typically grow fasterin shared environments.
(D) Because the free energy of a system containing two different species is always negative, populations that utilize similar resources cannot coexist in nature.
Answer: (B) When two populations use the same sources of energy, resource availability in a shared environment limits the growth of both populations.
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A. It stores water for the plant in times of drought. B. It stores sugar for the plant. C. It provides greater surface area for water absorption. D. It provides greater surface area for the growth of additional root meristems.
Modern cells are thought to have arisen from
a. protocells. b. pre-cells. c. gas and dust clouds. d. prokaryotic cells that predated protocells. e. prokaryotic cells that predated pre-cells.
The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. allows a mixed group of comparisons among different organisms for the experimental group.
Biochemicals, known as __________, are produced by glands, travel through the bloodstream, and alter the metabolism of specific target cells.
A. enzymes B. pheromones C. neurotransmitters D. hormones E. pectines