Why are liver cells a example of slow rate division

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

Si units are the modern form of the