6th hour - Lessons 3 & 4 practice

Front

What happens to a population when the birth rate is greater than the death rate?

Back

The population increases in size.

Front

What is the term for when individuals join a population?

Back

Immigration

Front

What is an example of commensalism?

Back

A bird finds an existing hole in a tree and builds a nest in it.

Front

What is a limiting factor in an environment?

Back

A part of the environment that prevents a population from growing too large.

Front

What occurs when organisms fight for limited resources?

Back

Competition

Front

What is the term for the number of live births in a population?

Back

Birth rate

Front

What is the term for the number of deaths in a population?

Back

Death rate

Front

What is the difference between immigration and emigration?

Back

Immigration is when individuals join a population; emigration is when individuals leave a population.

Front

What is the relationship called when one organism benefits and the other is neither helped nor harmed?

Back

Commensalism

Front

What is a biotic factor?

Back

A living component of an ecosystem that affects the population.