Which factors must be controlled during an experiment so researchers can draw a logical conclusion from the experiment?

scientific inquiries

theories

variables

operational definitions

Variables

Explanation:  Variables are used during an experiment and must be controlled so that researchers can draw a logical conclusion. The independent variable is the one that is changing and the dependent variable  is the one being measured.

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.