Reproduction in Organisms Important Questions for CBSE Class 12 Biology Reproduction 1.The period between birth and natural death of an organism is called its lifespan. It can vary from less than a day to more than 400 yrs. Whatever be the lifespan, death of every individual organism is a certainty, i.e. no individual is immortal, except single-celled organisms. Lifespan of … [Read more...]