Why is every step of the scientific method necessary, in order for a scientific investigation to be considered valid?

Steps of a scientific investigation include identifying a research question or problem, forming a hypothesis, gathering evidence, analyzing evidence, deciding whether the evidence supports the hypothesis, drawing conclusions, and communicating the results. Scientific research must be guided by ethical rules.

There are four basic steps involved with the scientific method. The usual steps include observation, hypothesis, experiment, and conclusion. The steps may not always be completed in the same order.

Let's build some intuition for the scientific method by applying its steps to a practical problem from 1.everyday life.

2.Make an observation. ...

3.Ask a question. ...

4.Propose a hypothesis. ...

5.Make predictions. ...

6.Test the predictions. ...

7.Iterate.

the answer would be d

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .