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Biology review chap 3-4

Horizontales
Biome with permafrost
Free floating or swimming small organisms
Tree that loses its leaves seasonally
Plants have short life cycles here
A rock is an example of an _____ factor in an environment
Organism that can produce its own food
Group of similar ecosystems
Process that removes carbon dioxide from the air
Group of similar organisms that can breed and produce fertile offspring
Relationship where both organisms benefit
Verticales
About 78% of the earth's atmosphere
Region of ocean where there is enough light for photosynthesis
Organisms nee nitrogen to make _____ acids
Study of relationships between living things and the environment
If ____ gases didn't exist, the earth would be much colder
Contains all of the parts of the planet with life
Occurs when 2 or more organisms try to use the same resource at the same time
All the living things in a particular place, along with their environment
Wetlands where rivers meet the sea
A ___ level is a step in a food chain
What an organism does... it's job in the ecosystem
These are similar to marshes, but have trees and shrubs