What are the scientific method steps?

1.Make an observation.

2.Ask a question.

3.Form a hypothesis, or testable explanation.

4.Make a prediction based on the hypothesis.

5.Test the prediction.

6.Iterate: use the results to make new hypotheses or predictions.

Explanation:

ask a question background research form  hypothesis experiment and observe draw a conclusion

Explanation:

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]