Answer:
a fossil that is useful for dating and correlating the strata in which it is found.
Explanation:
Maybe D I hope it helps you
Answer:
The answer is A.
Explanation:
Adaptive immunity recognizes antigens of viruses.
A gemstone is a piece of hard mineral that is considered exquisite in terms of physical properties and valuable because of its rarity or usefulness. In this case, the properties classify diamond as a gemstone is its <span>color and profitability. Diamonds are very expensive because of its rarity</span>
Answer:
down syndrome
Explanation:
people with down syndrome have an extra chromosome in the twenty-first pair
