Chapter 21 Resource: Ecology

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Name Date ClassNote-taking Worksheet (continued)3. Another important abiotic factor is ___________________.a. Some organisms are ___________________ for life in water.b. Water helps all living things carry out life processes, such as ___________________.c. Water can also serve as ___________________ and a way to move from place to place.4. The abiotic factor ___________________ is also essential to an ecosystem.a. The ___________________ is the main source of energy for most organisms on Earth.Meeting Individual Needsb. Energy from the Sun is used by green plants to produce ___________________.c. Humans get ___________________ by eating plants and other organisms that have fedon plants.E. Ecosystems ___________________ over time.Section 2Relationships Among Living ThingsA. Ecologists organize living things into ___________________ to make it easier to studyecosystems.1. A ___________________ is a group of the same type of organisms living in the same placeat the same time.2. All of the populations that live in an area make up a ___________________.3. Ecologists want to know the ___________________ of a population, where its memberslive, and how it is able to stay alive.4. Ecologists determine population ___________________ by comparing the size of a populationwith its area.5. Ecologists use ___________________ to study populations of animals that travel long distances.B. Populations do not have enough ___________________ to grow larger and larger forever.1. Things that limit the ___________________ of a population are called limiting factors.2. Limiting factors include ___________________, water, living space, and other resources.C. The most common interactions in a community are ___________________ interactions.1. Organisms will ___________________ for any resource that is in limited supply.a. The greater the population size of an area, the greater the ___________________ forresources.Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.30 <strong>Ecology</strong>
Name Date ClassNote-taking Worksheet (continued)2. ___________________ is the act of one organism feeding on another.a. A bird of prey, such as a falcon, is an example of a ___________________.b. A falcon’s ___________________ is the organism it eats.3. When the African tickbird eats insects off a zebra’s skin, both organisms in the relationship___________________.4. A bird that builds its nest in a tree ___________________, but the tree is neither harmednor helped.5. Insects biting a zebra’s skin ___________________ the zebra but benefit themselves.D. Each type of organism has a different ___________________ to play in an ecosystem.1. The role of an organism in an ecosystem is called its ___________________.2. The place where an organism lives out its life is called its ___________________.Section 3 Energy Through the EcosystemA. Energy moves through an ecosystem in the form of ___________________.Meeting Individual Needs1. An organism that makes its own food, such as a plant, is called a ___________________.2. ___________________, like grasshoppers, eat other organisms.Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.3. ___________________, such as bacteria and fungi, use dead organisms and the wastematerial of other organisms for food.B. A food chain models how ___________________ from food passes from one organism toanother.1. In an ecosystem, food chains often ___________________.2. A food web is a series of overlapping food chains that shows all the possible___________________ relationships in an ecosystem.C. In an ecosystem, matter ___________________ through food chains.1. The amount of ___________________ on Earth never changes.2. Matter in ecosystems is ___________________.<strong>Ecology</strong> 31
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Chapter 21 Resource: Ecology

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