how can we use the scientific method to make observations, pose questions, develop hypotheses, design and conduct investigations, and analyze data to draw conclusions?

Scientific method is scientific process that is used to find the answers about the questions or observation of a natural phenomenon for experimentation. It involves several steps and processes-

Make an observation - observing the phenomenon or problems,

Ask a question - form a question,

Form a hypothesis - making a possible explanation,

Make a experiment based on the hypothesis - design the investigation to test explanation,

Test the prediction

collecting investigation data,

Analyze the data and

Iterate - find the result or conclusion and required to repeat it with other possible explanation.

i think the answer is a.keratin is the pigment responsible for skin color.