The right option is;d. They can occur anywhere from thousands to billions of years
Long-term environmental changes are environmental changes that occur gradually over time and affects organisms over generations. Long-term environmental changes can occur anywhere and it allows organisms to adapt to its effect. Examples of long-term environmental changes include global warming, deforestation, sun’s intensity, earth’s orbit and urbanization.
The cell must replicated DNA because when the cell divides, the daughter cells must have identical copies of DNA. DNA replication occurs in the S phase during interphase of the cell cycle.
