Do you believe in reincarnation?

In Hinduism, eternal salvation (moksha) is to become free of the cycle of birth/rebirth. On attaining moksha one would go to heaven. When you attain moksha depends on your actions (karma). Bad actions could lead to one being reborn as an animal whereas sustained good actions would lead to ultimate salvation.

USResident - humans could be reborn as animals/plants and vice versa. Plus new souls are also sent to the earth. Thats why the increase in human population :)