Chapter 10: Ecosystems section 1: Living Things and the Environment organism habitat biotic factor abiotic factor photosynthesis species population community ecosystem ecology

A. Habitats 1. organism- living thing 2. organism obtains from the environment: -food, water, shelter 3. in order to: -live, grow, reproduce

4. One area may contain many habitats. 5. Organisms live in different habitats because they have different needs for survival.

B. Biotic Factors An organism interacts with both living and nonliving parts of its habitat. biotic factors- living parts of habitat abiotic factors- nonliving parts of habitat

C. Abiotic Factors 1. water- carry out life processes 2. Sunlight- 3. Oxygen- carry out life processes -20% of air is O2 - human body can only live a few minutes without it

4. Temperature- the range of temps in an area determine the types of organisms that can live there

5. Soil- mixture of rock fragments, nutrients air, water, and the decaying remains of living things -the composition of soil in an area influences the kinds of plants that can grow there.

D. Levels of Organization Organisms live together in populations and communities with abiotic factors in their ecosystems. Population: members of one species in a particular area

2. Communities- All the different populations that live together in an area -they interact by sharing the same resources

3. Ecosystems -community of organisms that live in a particular area, along with their nonliving surroundings

Ecology: the study of how living things with each other and with their environment