This page offers some rough estimates of the numbers of wild animals on Earth. Collectively, wild land vertebrates probably number between 1011 and 1014. Wild marine vertebrates number at least 1013 and perhaps a few orders of magnitude higher. Terrestrial and marine arthropods each probably number at least 1018.
How long do head lice live? The life span of an adult louse on a host ranges up to 30 days. During this time, the female head louse can deposit about 90 eggs. After incubating for seven to 10 days, the nits hatch and, after another 10 days, mature into adult head lice and the cycle begins again.Off the host, adult head lice can live about two to four days at 74 degrees Fahrenheit (F) and one to two days at 86 degrees.Nits will remain alive off the host for up to 10 days; they will not hatch at or below room temperature (68 degrees F).fter incubating for seven to 10 days, the nits hatch and, after another 10 days, mature into adult head lice and the cycle begins again. Off the host, adult head lice can live about two to four days at 74 degrees Fahrenheit (F) and one to two days at 86 degrees.
Adult head lice can live for approximately 24 hours away from a host, according to the Centers for Disease Control. Nymphs, or young head lice, can live for only several hours away from a host. Lice eggs are less dependent on a host, and they can live for up to one week without a host. Continue Reading.