The results of human activity on the natural environment are called _[blank]_ effects.
a...
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How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey
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What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.
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What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron
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Which of the following are causes of evolutionary change? 1)genetic drift 2) natural selection 3) gene flow 4)mutation
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