This topic contains a solution. Click here to go to the answer
|
|
Did you know?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Did you know?
The average office desk has 400 times more bacteria on it than a toilet.
Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.