In which era was there animal life found only in the ocean but plants were growing of land?
a. cenozoic era
b. mesozoic era
c. precambrian era
d. palezoic era

Apart of an ecosystem that can restrict the growth of a population is referred to as

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Speed is the ratio of the distance of an object moves to