A year containing an extra day. It has 366 days instead of the normal 365 days. The extra day is added in February, which has 29 days instead of the normal 28 days. Leap years occur every 4 years. 2016 is a leap year and so is 2020. Except that every 100 years special rules apply.
Best Answer: A average life span is about 1 year. Some live only 3 months, but others can live up to a couple of years. The lifespan of the average tick is about two years. Source(s): http://www.nyc.gov/html/doh/html/ehs/ehs... A fly is 3 days so i'm guessing somewhere around the lines of there.
Life expectancy is the most commonly used measure to describe population health and reflects the overall mortality level of a population.Life expectancy measures how long, on average, a person is expected to live based on current age and sex-specific death rates.In summarising mortality patterns, life expectancy is often expressed as the number of years of life a person born today is expected to live.ife expectancy measures how long, on average, a person is expected to live based on current age and sex-specific death rates.