The two-layered sac surrounding the heart is the pericardium.
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Answer:
The winter solstice in the Southern Hemisphere is June 20 or 21, while the summer solstice, the longest day of the year, is December 21 or 22.
So I think the answer is
<em><u>D) celebrate the summer solstice</u></em>
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<span>The chromosomes of two diploid cells split apart at the centromere</span>
Smallest to largest- molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.
Not sure which 7 you're looking for
