3. The nervous system works together to communicate with different parts of the body and with the external environment. Spinal cord damage can affect the whole system because the spinal cord . A. controls the actions of the brain and peripheral nerves B. is the most important organ in the nervous system C. mediates communication from the brain to the rest of the body D. is primarily involved in communication with the external environment

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Power can be defined as a. the distance over which work was done. b. how much work can be done in a given time. c. all the work in an given area. d. the energy required to do work.

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.