Which of the following words can appear in science and other subjects?
(1)an
(2)a digestive
(3)a social
(4)a
a) system
b) force
c) fossil
d) vertebrate

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

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

The combining form leuk/o means red true or false