Answer: C
Explanation: Because if silver is tarnished it will lose its luster, thus making it not attractive.
Answer:
The answer is D: Recombinant DNA is produced by pasting together DNA from two sources
Explanation:
Recombinant DNA, or rDNA, is made by pasting together 2 halves of DNA strands from different sources
Answer:
A common birth defect that is usually due to an extra chromosome 21( trisomy 21) .
Enzymes<span> are protein catalysts that speed biochemical </span>reactions<span> by facilitating the molecular rearrangements that support cell function.
</span>