Demonstrating the occurrence of interspecific competition during a field study is problematic for all of the following reasons, except
A) it is difficult to know whether a population is at carrying capacity.
B) competition is impossible to measure in a natural setting.
C) scientists cannot control the environment.
D) scientists lack full knowledge of the life history requirements of natural populations.
B
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The maintenance of a constant environment in a cell is called __________.
A. active transport B. homeostasis C. gene expression D. translation
In the pressure flow theory, any part of a plant that does not carry out photosynthesis is a
A. source. B. sink. C. reservoir. D. aqueduct. E. companion cell.
Which of the following is in contact with the soil into
which it is growing? a. vascular cylinder b. apical meristem c. root cap d. pericycle e. outer cortex
Which statements correspond to amphibolic pathways? 1. anabolic and catabolic reactions are joined through common intermediate 2. shared metabolic pathways 3. Feedback inhibition can help regulate rates of reactions 4. both types of reactions are necessary but do not occur simultaneously
A) 1 only B) 1, 2, 3 C) 1, 2, 3, 4 D) 2, 4 E) 2, 3, 4