A child receives a balloon filled with 2.42 L of helium from a vendor at an amusement park. The temperature outside is 311
K. When the child brings the balloon into an air-conditioned
room, the volume of the balloon decreases to 2.30 L. What is
the temperature of the air-conditioned house? Assume the
pressure in the balloon stays the same.

Humans have 23 pairs of chromosomes--22 pairs of numbered chromosomes, called autosomes, and one pair of sex chromosomes, X and Y. The extra chromosome 21 leads to the physical features and developmental challenges that can occur among people with Down syndrome. Researchers know that Down syndrome is caused by an extra chromosome, but no one knows for sure why Down syndrome occurs or how many different factors play a role.

Explanation:

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