1. Chapter 21: Section 1, pg 705
Key concepts: What needs are met by an organism’s environment?
What are the two parts of an organism’s habitat with which it interacts? What are the levels of organization within an ecosystem?
Key terms: organism, habitat, biotic factor, abiotic factor, photosynthesis, species, population, community, ecosystem, ecology

2. Organisms and habitats
An organism is a living thing.
Organisms need to obtain food, water, shelter to live
Habitats are environments that provide areas for organisms to grow and live.
Organisms live in different habitats because they have different requirements for survival.

3. Biotic factors
An organism interacts with both living and nonliving parts of its habitat.
Biotic factors are the living parts, like animals, plants, and insects.

4. Abiotic factors
Are the nonliving parts of a habitat. Water, sunlight, oxygen, temperature, and soil.
Water – all living things need water.
Sunlight – needed for photosynthesis (plants make their own food in chloroplasts) which fuels plants to grow. Animals then eat the plants.
Oxygen – most living things require oxygen
Temperature – temperatures determine what kind of organisms live there
Soil – mixture of rocks, nutrients, air, water, and decaying remains of organisms

5. Levels of organization
Species – group of organisms similar enough to mate and have offspring that can also reproduce
Population – all the members of one species in a particular area
Communities – all the different populations that live together in an area
Ecosystems – the community of organisms that live in a particular area, along with their nonliving surroundings.

6. In other words:
The smallest level of organization is a single organism, which belongs to a population that includes other members of its species. The population belongs to a community of different species. The community and abiotic factors form an ecosystem.

7. And, finally
Ecology – the study of how living things interact with each other and with their environments.

8. Please complete: Section 1 assessment in your notes, 1abc, 2abc, 3abc
I will check it at the start of our next science period.