Answer:
A 0.9% solution of NaCl (saline) is isotonic to animal cells. When exposing animal tissues to solutions, it is common to use an isotonic solution such as Ringer's buffered saline so as to prevent osmotic effects and consequent damage to cells.
Explanation:
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The genetic info is found in the nucleus.
Answer: a compound known as calcium carbonate (CaCO3)
Explanation: Google the question itself