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Explain why biological control methods are generally environmentally superior to chemical pest control methods.
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Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.
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Why are current extinctions of concern to enviromentalists?
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Imagine a person stepping on a pin and pulling his or her foot away. look at the reflex arc of this scenario below. which statement best describes the image? a)the sensory nerve carries the signal from the effector to the interneuron, and the motor neuron carries the signal to the receptor. b)the motor nerve carries the signal from the receptor to the interneuron, and the sensory neuron carries the signal to the effector. c)the sensory nerve carries the signal from the receptor to the interneuron, and the motor neuron carries the signal to the effector. d)the sensory nerve carries the signal from the receptor to the motor neuron, and the interneuron carries the signal to the effector.
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after the zygote begins to divide, a fluid-filled ball of cells, called a(n) attaches to the uterin...
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