Your heart rate and muscle function (from stretching)
Answer:
Individuals with access to water with no fluoride added.
Explanation:
When we want to do an experiment we must establish which will be the experimental group (one where the factor tested in the experiment is applied) and a control group (one that was set exactly the same as the experimental group but the factor tested in the experiment was not applied). In the case shown in the question above, the student wants to develop an experiment that tests whether fluoridated water is effective in preventing tooth decay.
This student's experimental group is a group of people who consume water with the addition of fluor (factor tested in the experiment) in their composition, whereas their control group will be a group of people who do not consume water with the addition of fluor in their composition.
Answer:
Sensory neurons.
Explanation:
The sensory neurons are the active neurons that is responsible for the sensing of any activity occur on the skin. This sensory neuron send messages to the central nervous system in order to get instructions for the muscles to do suitable actions. The motor neuron send messages from central nervous system to the muscles. The burning of feet sense by sensory neurons present in the feet so avoiding such burning, the individual makes a decision of going into the ocean fastly.
