Demography
The three basic resources animals need to survive?
What are food, water, and shelter?
It took 50 years for the Earth's population to double from 1 billion to 2 billion. It took this many years for the population to double to 4 billion.
What is around 40 or 40 something years?
The maximum population that an environment can sustain indefinitely.
What is carrying capacity?
The largest part of a population pyramid in a rapidly growing population.
What is the bottom
The average number of years an individual is predicted to live is called
What is life expectancy?
The shape of a population pyramid of a least developed country.
What is a pyramid?
These services lower the fertility rate in developing countries.
What is family planning services