Page 71 - Science Course 3 (Book 1)

Interactions in the Ecosystems Mo2-L4a: How Do Organisms in an Ecosystem
Lesson 4 Interact?

Overpopulation

condition that occurs when a population becomes so
In this topic, you will learn the following large that it causes damage to the environment.
lessons:

Mo.2–L4a: How Do Organisms in an Ecosystem
Interact?

Mo2-L4a How Do Organisms in an
Ecosystem Interact?

KEY CONCEPTS:
1. How does a niche differ from a habitat?
2. In what ways can organisms interact in an Predation
ecosystem? the act of one organism, the predator, feeding on
another organism, its prey.

Vocabulary A-Z

Let us learn some vocabulary

Niche
the way a species interacts with abiotic and biotic
factors to obtain food, find shelter, and fulfill other
needs.

Branches &
Leaves: bees,
wasps, months Symbiosis
squirrels, blue tit a close, long-term relationship between two species
and hawks. that usually involves an exchange of food or energy.

Trunks: Insects
& larvae

Root & Litter Zone:
bacteria, earth-
worms, wood lice
and fungi.

Competition Mutualism
the demand for resources, such as food, water, and a symbiotic relationship in which both organisms
shelter, in short supply in a community. benefit.

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