A Population Pyramid! :)
cells
a line graph
Community
It's called a community.
a community
Its called a habitat, my dear.
Many populations in one area are called a community. This term refers to different species interacting and coexisting in a specific habitat or ecosystem.
There are lots of places called Nelson. They each have different populations.
A Branching tree
They are called roman numerals.
Several groups of populations in an area/habitat is called a community.
They're not. Prime numbers and square numbers are different things.