Why are most food chains limited to three to five trophic levels?
A) The higher the trophic level, the larger the organism; the larger the organism, the less likely it will be prey.
B) The nutritional quality of existing biomass decreases with increasing trophic level.
C) Most ecosystems have insufficient space to support the increased number of organisms that more trophic levels would require.
D) There is insufficient energy to support more trophic levels.
D
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The use of microorganisms or their products to alleviate plant disease is called biological control
Indicate whether the statement is true or false
Which environment would be most likely to harbor a biodiversity hotspot?
a. tropical island b. temperate grassland c. temperate deciduous forest d. desert e. savanna
The failure of chromosomes to separate during mitosis or meiosis is called
a. genetic displacement. b. trisomy. c. crossing over. d. nondisjunction. e. disjunction.
Which of the following statements about Charles Darwin is FALSE?
a) He was enthusiastic about unleashing his theory of natural selection on the world as soon as he thought of it. b) He dropped out of medical school. c) He was under constant pressure from his father to make something of himself. d) He was an ordained pastor and didn't believe in evolution when he was young. e) He and Alfred Russell Wallace independently came up with the theory of evolution by natural selection.