To ensure the continuity of the species
increase variation in species for natural selection to occur
Isolation. Is best to break infection
Answer:After puffing off its outer layers, the star collapses to form a very dense white dwarf. One teaspoon of material from a white dwarf would weigh up to 100 tonnes. Over billions of years, the white dwarf cools and becomes invisible.
Explanation: googel hope it helps
1. to restore dying cells 2. to repair damaged cells 3. to reproduce
