Adenine and guanine
Thymine and cytosine
Answer: D. Keratin
Explanation: Keratinocytes (pronounced: ker-uh-TIH-no-sites) make keratin, a type of protein that's a basic component of hair, skin, and nails. Keratin in the skin's outer layer helps create a protective barrier.
Answer:
A sphere full of air
Explanation:
because you pump it up and it is very fun to use
