“Interactions of Living Things” Chapter 2

Chapter 2 – Section 1  Everything is Connected  All living things are connected in a web of life.

The biotic part of an environment is made up of all the living things found within it.

The abiotic part of an environment is made up of all of the nonliving things found within it, such as water and light.

. An ecosystem is made up of a community of organisms and its abiotic environment.

Chapter 2 – Section 2  Living Things Need Energy  Producers use the energy in sunlight to make their own food. Consumers eat producers and other organisms to gain energy.

All organisms are important to maintain the balance of energy in the food web. Energy pyramids show how energy is lost at each food chain level

Chapter 2 – Section 3  Types of Interactions  Limiting factors in the environment keep a population from growing without limit.

Competition Two or more individuals or populations trying to use the same resource is called competition.

Prey A predator is an organism that eats all or part of another organism. The organism that is eaten is call prey.

Prey have developed features such as camouflage, chemical defenses, and warning coloration, to protect them from predators.

Symbiosis Symbiosis occurs when two organisms form a very close relationship with one another over time.

Close relationships over a very long time can result in gradual, simultaneous changes of the organisms in the relationship. For example, flowers and their pollinators have developed traits that benefit both.