Answer:
Lithium
Explanation: Lithium (Li) is the strongest reducing agent in the periodic table.
Quaternary. If multiple polypeptides come together, that is the quaternary structure.
“3rd eyelid” that covers the eyes, but is transparent -- J. Watch for obstacles and prey while still protecting the eyes
<span>Long eyelashes -- E. Keep desert sand out of eyes
</span>
Eyes set on the side of the head -- I. Watch for predators approaching from the side or behind
Eyes set in front -- G. “binocular” 3D vision to better hunt prey
<span>Large amounts of body fat -- H. keep warm in an icy habitat
</span>
<span>Staying under rocks at midday -- B. keep cool in a hot habitat
</span>
Bright, colorful markings -- A. warn predators away by appearing toxic
<span>Drab, brown coloration -- D. camouflage from predators in the dirt
</span>Singing a loud, complicated song -- F. attracting more mates than others
<span>Remaining so still that breathing is not detectable -- C. prey will come right up to be captured</span>
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