Astudent had been studying mendel and his crosses using peas. the student wanted to test whether people preferred the flavor of green peas or yellow peas. she cooked peas of both colors and fed them to her classmates, then recorded whether each individual preferred the taste of the green peas or of the yellow peas. what would be an important variable for her to hold constant during this experiment?

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

What factors contribute to the effect an environmental toxin has on the human body?

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient