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Living Things and the Environment

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Living Things and the Environment Seventh Grade Chapter 22-1 Ecosystems All the living and nonliving things that interact in a particular area make up an ecosystem. – PowerPoint PPT presentation

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Title: Living Things and the Environment


1
Living Things and the Environment
  • Seventh Grade
  • Chapter 22-1

2
Ecosystems
  • All the living and nonliving things that interact
    in a particular area make up an ecosystem.
  • Some examples of ecosystems are mountains,
    oceans, desserts, and forests.

3
Habitats
  • A habitat is a specific place in an ecosystem
    where an organism obtains food, water, shelter,
    and other things it needs to live, grow, and
    reproduce.
  • A single ecosystem may contain many habitats.

4
Habitats cont.
  • Some examples of habitats in a forest ecosystem
    are plants growing in the damp soil, bears on the
    forest floor, and birds in nests at the top of a
    tree.
  • Organisms live in different habitats because they
    have different requirements for survival

5
Biotic and Abiotic Factors
  • The living things of an ecosystem are called
    biotic factors.
  • Examples
  • - grass, plants, hawks, badgers, worms,
    fungi, and bacteria that all live in the same
    ecosystem
  • The nonliving things in an ecosystem are called
    abiotic factors.
  • Examples
  • - water sunlight, oxygen, temperature, and
    soil.

6
Water
  • Water is very important to all organisms.
  • The human body is made up of about 65 water.
  • Plants and algae use water, along with sunlight
    and carbon dioxide, to make food in a process
    called photosynthesis.

7
Sunlight and Oxygen
  • Sunlight is necessary for photosynthesis which is
    important because without plants or algae to
    provide a source of food, few other organisms
    would live.
  • Most living things require oxygen to carry out
    their life processes.
  • Organisms on land obtain their oxygen from the
    air while fish and other water organisms obtain
    dissolved oxygen from the water.

8
Temperatures and Soil
  • Temperatures that are typical of an area
    determine what can live there.
  • Some animals alter their environments to overcome
    very hot or very cold temperatures.
  • The type of soil in an area influences the kinds
    of plants that can grow there.
  • Some organisms make their homes in the soil.

9
Population
  • All the members of one species in a particular
    area are referred to as a population.
  • Studying the population is hard to do without a
    specified area. Ex. (Charlotte County)

10
Community
  • All the different populations that live together
    in an area make up a community.
  • In a community the different populations must
    live close enough together to interact with one
    another.
  • They interact by using the same resources, such
    as, food and shelter.

11
Levels of Organization
  • The smallest unit of organization is a single
    organism, which belongs to a population of other
    members of its species.
  • The population belongs to a community of
    different species.
  • The community and abiotic factors together form
    an ecosystem.

12
Ecology
  • The study of how living things interact with one
    another and with their environment is called
    ecology.
  • Ecologists study how organisms react to changes
    in their environment.
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