When a scientist conducts an investigation, which of the following is the first thing he or she should do?

Make an observation

Explanation:

The scientific method or any scientific investigation, starts with observation. Observing natural phenomena, to be specific, will ellicit questions that can be later on, if applicable made into a hypothesis. These are generally the first steps (put together).

After a hypothesis is made, testing or an experiment will ensue to test whether the hypothesis will hold or not.

put on saftey things