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

factor that controls the growth of a population

can be produced or replaced by healthy ecosystem

Shorter trees and vines form a layer

below the photic zone

number of males and females of each age a population contains

number of organism per unit area

cannot replenish them within a reasonable amount of time

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

maximum number of individuals an enviroment can hold of a species

using resources in such an enviromentally concious way

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

when a population growth slows and steps

the practice of planting a single productive crop year after year

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

affects whole population on similar way

refers to the variety of habitats