Astronomers use light years to measure distances in space because space is so massive and distances so far that conventional numbering is inadequate and unmanageable. One light year is a distance measurement equivalent to six trillion miles.
I think tissue or a nucleus
Cells, the basic unit of life, are derived from spontaneous generation.
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d. vessels that carry water and nutrients
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The ocean takes in that carbon, as a result, the ocean becomes more acidic which has many negative effects on ocean life.