Respuesta :

GracyGirl
Like a race, life has a beginning and an end.
Also like a race, we strive to do the best we can during our life.

Hope that helps :)
osprey2015
Genetic contest to get evolution going "your" way as quickly (timescale unknown) as possible ??? The relay part of the race is, presumably, the reproduction cycle - passing on the baton so to speak ...