Which sentence most likely explains why the rock has large open pores?
A. Softer parts of the rock melted in sunlight, leaving behind empty holes.
B. Contact with hard pebbles during cooling left dents in the rock.
C. Bubbles formed in the magma when it was still in liquid form.
D. Crystals embedded in the rock fell off due to friction in Earth’s crust.

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous