The diagram displayed below shows a plane mirror reflecting a laser beam. θi is 42 degrees. What is θr?

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the correct answer is 2 and 4

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.

essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.