Carbon monoxide is not heavier than air. A carbon monoxide alarm should be installed in a location where the alarm will stay clean, and out of the way of children or pets. Refer to the user's manual for specific installation requirements. Â« Back To FAQs List.
A leech is an annelid or segmented worm related to earthworms. Most are aquatic although there are land leeches in the tropics. Some leeches are blood sucking parasites bu â¦ t others are predators.
1 Annelida: Class Hirudinea-Class Hirudinea This class includes the 500 species of leeches, flattened, predacious or parasitic 2  ... leech-leech leech, predacious or parasitic annelid worm of the class Hirudinea, characterized by a ...