Mr. Smith designed an experiment to see which group of students would test the highest. He set
up three groups of 25 students. Group A did not
study for the test, group B studied for 5 hours, and
group C studied for 10 hours.
Which group is the control group?
A. Group A
B. Group B
C. Group C
D. There is no control group
of 3

what's the question?

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers

then go eat. lol.brainliest