Musk, a substance with a strong, penetrating odor. It is obtained from a large abdominal gland of the male musk deer. Musk activates sperm cells during the mating season and its scent attracts females. Musk is an oily brownish liquid when fresh, a grainy powder when dried. Diluted with alcohol, it is used in perfumes to slow evaporation. The characteristic odor of musk is caused by a substance called muscone, or muskone, which can be synthetically produced. Other animals, such as the muskrat, and some plants yield musklike substances.
If you feel like you just can't get away from all the flying, buzzing insects, you may be right -- insects far outnumber humans. Scientists can only estimate the number of insects on Earth. Take this quiz to find out how much you know about the multitudes of insects on the planet.
Cephalopod is a marine animal. Squids, octopuses is argonauts, nautiluses is and cuttlefish are all cephalopods.