The experiment looks at certain aspects of human _________.

c) behavior

b) vivid

a) group

behavior - noun - the actions and reactions of a group, person, animal, or thing.

I belong to a youth _____ at my church.

c) soar

b) group

a) plead

group - noun - a collection of things, ideas, or people that are assembled or related

He ________ with his boss to give him another chance.

c) behavior

b) vivid

a) plead

plead - verb - to earnestly request or appeal.

The hawk _______ over the meadow.

c) soared

b) youth

a) group

Soar (soared) - verb - to fly or glide swiftly, effortlessly, and usu. at a great height.

These tropical birds have _____ coloring.

c) group

b) vivid

a) behavior

vivid - adjective - bright; brilliant; intense.