The experiment has（）the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.

A. The cougar jumped from the rock.
B. Tom struggled free of his father.
C. Jeb asked Tom to get the knife.
D. Jeb held Tom across his body.

A. By keeping shouting and hitting.
B. By making a wall out of his arms.
C. By throwing himself on the cougar.
D. By swinging his fists at the cougar’ s eyes.