Tall trees that form a dense leafy covering

the sunlight region near the surface in which photosynthesis can occur

number of individual per unit area

Shorter trees and vines form a layer

below the photic zone

number of males and females of each age a population contains

A plant that sheds its leaves during a particular season

organism that live on the bottom of lakes, streams, and oceans

a population may grow if individual move into its range from elsewhere

trees that produce seed bearing cones and leaves sharp like needles

general term for photoplankton and zooplankton

a population may decrease in size if individuals move out of the population's range

a layer of permanently frozen subsoil

an ecosystem in which water covers to soil or is present

the l;arger a population gets the faster it grows