1. Chapter 24
Section 1

2. Biosphere Biosphere: Biosphere includes:
Part of Earth that supports Life
Biosphere includes:
Top portion of Earth’s crust
All the water that covers Earth’s surface
Atmosphere that surrounds Earth
What are some different environments on our biosphere?
Desert
Tropical Rain Forest

3. Biosphere Earth is the 3rd planet from the Sun
The amount of energy that reaches Earth from the sun helps make the temperature just right for living here.
Why can’t we live on other planets?
Mercury = Too hot during the day & too cold at night
Venus = High temperatures & a thick carbon dioxide atmosphere
Mars = Much colder than Earth & a thin atmosphere

4. Ecosystems
Ecosystem
All of the organisms living in an area
Includes the nonliving parts of the environment too
Example: Bison, grass, birds, and insects are living organisms in a prairie ecosystem. Water, temperature, sunlight, soil, and air are the nonliving features.
Ecology
Study of interactions that occur among organisms and their environment.

5. Populations Population:
Made up of all the organisms of the same species that live in an area at the same time.
All the bison in a prairie ecosystem
All the grasshoppers in the prairie ecosystem make up another population
Do we ever study how these different populations interact together?
Yes!

6. Populations Community:
All the populations of all species living in an ecosystem
Example: Prairie community is made of populations of bison, grasshoppers, cowbirds, and all other species in the prairie ecosystem.
Arctic community:
Populations of fish, seals that eat fish, and polar bears that hunt and eat seals.

7. Habitat Where does an organism live? Habitat
Place in which an organism lives
Example: A woodpeckers habitat is a tree
Salamander’s habitat is the forest floor beneath fallen leaves and twigs. They don’t like sunlight – they prefer damp, dark places.
This habitat provides the kinds of food and shelter, the temperature, and the amount of moisture the organism needs to survive.