There are examples of microbial bacteria that are beneficial to humans
Indicate whether the statement is true or false
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A motor neuron connects to muscle cells through
A) electrical synapses. B) chemical synapses that use the neurotransmitter acetylcholine. C) myofibrils. D) sarcomeres.
A pharmaceutical company wishes to study a possible new headache medicine. They are doing human trials with 1,000 volunteers who experience frequent headaches. The researchers will need to ________
A) control for the type of headache—stress, migraine, or other causes B) have 10 volunteers in the control group C) put all women in the control group and all men in the experimental group D) give all 1,000 volunteers the same amount of the new medication
During the earliest history of the earth, ________
A) the earth was cold and lacked any source of heat. B) the earth did not have any radioactive material C) the temperature increased so that iron and nickel melted D) almost all of the material was radioactive, and it decayed to the compositions we have today.
U.S. geothermal energy is most available in ________
A) the Florida Keys B) the Northeast C) Texas D) the West E) the Southeast