Lifespans. Part 1.

The first in a two-part series which investigates how and why we live as long as we do, and why different species have different lifespans. The first part focuses on why different organisms have their own particular lifespans. We find out about species which have very long lives such as the giant sequoia trees in California which can live to more than 3000 years old, and compare them with those which may only live for a few months like moths.