Answer:a. A cataract is a clouding of the lens. Some cataracts are congenital, but most are due to age-related hardening and thickening of the lens, diabetes mellitus, or exposure to UV rays over time. The lens can be removed and replaced
with an artificial lens.
Explanation:
The primary difficulty is the fact that we do not know all of the organisms that currently exist in the world along with those that existed in the past.
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Answer:
atmospheric pressure
Explanation:
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B. Plastron is the bottom half of a turtle's shell
