** answer asap andd you dont have to give me a reason of why its correct just give me the correct
some mammals and reptiles survived the cretaceous extinction. why did mammals become widespread and successful during the cenozoic era?

a.
mammals could eat a variety of foods, including plants and meat.

b.
mammals had adaptations that them thrive in cold weather.

c.
mammals could grow very large, much larger than reptiles.

d.
mammals were already diverse and numerous when the cenozoic era began.

Match your vocabulary word to its definition. 1. emigration 2. immigration 3. migration 4. overpopulation 5. sustainable development 6. under population 7. unsustainable development 8. urbanization the movement from one place to another the number of people exceeds the available natural resources in an area leaving one's homeland to settle in a new place the increase in the population of a city the movement of people to a new country the ability to meet current needs without reducing the ability to meet future needs resources being used up at a faster rate than they can be replenished birth rate insufficient to replace the existing population