Which statement about a needle is true? a. a needle rubbed with a magnet is a permanent magnet. b. a needle rubbed with a magnet is a temporary magnet. c. a magnet has no affect on a needle, even after rubbing it. d. a needle rubbed with a magnet decreases the magnet's effectiveness.

The reaction q+r2=r2q is found to be first order in r2 and

56.16 gregor mendel was the first scientist to use statistics to analyze scientific data. before mendel's experiments, scientists believed that organisms acquired traits from their environment and passed them on to their offspring. after mendel's discoveries were accepted, scientists realized that traits passed to offspring were the result of genes being passed from parents to offspring. this is an example of pls

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together