Which of these describes something that would increase the validity of an experiment?

a) having no dependent variables

b) having a single experimental group

c) having other scientists repeat your results

d) having to enter your experiment in a science fair

B

Explanation:

Most experiments require a control group AND one experimental group.

C) having other scientists repeat your results

Explanation:

The fact that other scientists repeat an experiment will increase the validity of it, since the probability of an error will be lower due to a bad measured coming from a single scientist.

For example, in the release of the first image of a black hole. Some different groups of scientists treated the data using different methods to get that image, and all of them reached the same result.

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​