Define the terms.
i. Stimuli ii. Habitat

Stimuli: A stimulus is any detectable change in the internal or external environment, capable of eliciting a response in the organism.

Habitat:

The natural home or environment of an animal, plant, or other organism.

Or,

A habitat is a place where an organism makes its home.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;