Decomposed organic waste used to add nutrients to crops is called [compost, renewable, affluent].
Compost
A change in population over time is called a(n) [overpopulation, consumption, population trend].
Population trend
When people or animals move from one place to another, it is called [immigration, migration, emigration].
Migration
Chemicals that are [nontoxic, toxic, affluent] do not harm the environment.
Nontoxic
The number of births per 1,000 people each year is the [population trend, fertility rate, birth rate]
Birth rate
When a population is too large to be sustained by available resources, [malnutrition, population trend, overpopulation] has happened.
Overpopulation
Food shortages and disease can increase [death rates, shoe sizes, water quality]
Death rates
Scientists called [biologists, demographers, zoologists] study population and population trends.
Demographers
People of [fertility rate, birth rate, reproductive age] are capable of having children.
Reproductive age
During [malnutrition, consumption, migration] resources are used and waste is produced.
Consumption
Some resources are [renewable, non-renewable, exponential], meaning they can regenerate if not used too quickly.
Renewable
People who do not get enough to eat can suffer from [dysentery, chicken pox, malnutrition].
Malnutrition
[Consuming, Recycling, Driving] is a way to reduce one's environmental impact.
Recycling
