1. Interaction between living Things

2. 1. Adapting to the environment
Natural selection: process where a characteristic that makes an individual better suited to their environment becomes common.
Adaptation: behavior and/or physical characteristic that allows an organism to live successfully
Ex. Penguin, cheetah, finches

3. 2. Competition: struggle between organisms to survive and obtain a limited resource.
Ex. Warblers in pine

4. 3. Predation Interaction in which an organism kills another for food
Predation can greatly effect population size
Too many predators causes a decrease in prey population which then causes a decrease in predators.
Predators/prey populations rise and fall in cycles

5. Predators have adapted to become better and more efficient
Ex. Hunting at night, speed, eyes
in the front of their head

6. Prey have also adapted to avoid being eaten
Mimicry
False coloring
Warning colors
Camouflage

7. Symbiosis

8. Symbiosis – relationship between 2 species that benefits at least one of them

9. Mutualism – a relationship in which both species benefit
Ex. Rhinoceros and tick bird
Ex. Bee and flower
Ex. Crocodile and plover

10. Ex. Birds nesting in trees Ex. Whale and barnacle
Commensalism – a relationship in which one species benefits and the other in neither helped or harmed
Ex. Birds nesting in trees
Ex. Whale and barnacle
Ex. Clown fish and sea anemone

11. Parasitism – a relationship in which one species benefits and the other is harmed
Parasite – organism that benefits
Host – organism that is harmed
Parasite usually live inside or on the host
Parasites usually do not kill their hosts. WHY?
Ex. fleas. ticks, leeches, tape worms