Answer:
A
Explanation:
Artificial means man made or not made by nature basically, meaning that humans breeding organisms for certain characteristics would be artificial.
<span>In mammals, air enters lungs through tubes called _____, which branch into smaller tubules called _____, which extend out to tiny air sacs called _____.
trachea; bronchioles; spongy tissue
>> bronchi; bronchioles; alveoli
bronchi; alveoli; gills </span>
Answer:
keratinocytes
Explanation:
The skin contains various types of cells like melanocytes, keratinocytes and Langerhans cells. The Keratinocytes constitute about 90% of the human skin and are mostly present in the basal skin.
The keratinocytes produce keratin protein which protects the skin and some keratinocytes contain keratohyalin granules which are filled with cysteine-rich and histidine-rich proteins. The keratin and these granules make the skin waterproof.
Thus, keratinocytes are the correct answer.
<span>These extra calories are needed by people with HIV because their immune system is constantly fighting off the HIV virus. This is because HIV attempts to evade the infection even as the immune system attempts to eradicate it. The extra calories give the immune cells, which are extra strained, the energy to perform their functions.</span>
