a model that explains the change from high birthrates and death rates to a condition of low birth rates and death rates?

the change in a population's size during a particular period of time

a period of time in the mid-1700s when societies started to shift from a rural life to an urban life and began to use machines powered by fossil fuels

a measurement of infant deaths based on the number of babies per 1000 that do not survive their first year of life

the average number of years a person is expected to live

the total fertility rate for a nation that would keep its population size stable

the average number of children a female member of a population has in her lifetime

the build-up of large concentrations of toxic chemicals in the body over time

chemicals that cause cancer

from producers to primary consumers, and on up the food chain, concentrations of toxic chemicals can be greatly magnified

the amount of a substance an organism is exposed to

a disease that has appeared in the human population for the first time

the study of how environmental factors affect human health and our quality of life

the study of disease in human populations

factors that threaten or are harmful to human health

diseases caused by a pathogen

chemicals that affect the nervous system

disease causing agents

matter and/or energy that is released into the environment

the effect of an organism as a result of exposure to a substance

the process of measuring the risk of being exposed to a harmful substance

chemicals that harm embryos and fetuses

how harmful a substance is to an organism

the study of how poisonous substances affect an organism's health