Why did scientists follow a set order of steps when carrying out a scientific investigation ?

If vegetable oil is made out of veggies, then what is baby oil made out of?

Where in the cell are ribosomes made?

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?