Page 17 - Science Course 2 (Book 1)

Invertebrates Mo1-L2a: What is an Invertebrate?
Lesson 2

Molting

a process in which an outer covering, such as an
In this topic, you will learn the following exoskeleton, is shed and replaced.
lessons:

Mo.1-L2a: What is an Invertebrate?

Mo1-L2a What is an Invertebrate?

KEY CONCEPTS:
1. What characteristics do invertebrates have in Metamorphosis
common?
2. How do the groups of invertebrates differ? a developmental process in which the body form of
an animal changes as it grows from egg to adult.

Vocabulary A-Z

Let us learn some vocabulary

Parasite

an animal that survives by living inside or on another
organism, gets food from the organism, and does
not help in the organism’s survival.
Let’s Begin

What is an invertebrate?

• Animals without backbones
are called invertebrates.

Mantle
• Most invertebrates
thin layer of tissue that covers a mollusk’s internal support their bodies
organs. with either a hydrostatic
skeleton—a fluid-filled
internal cavity—or an
exoskeleton.

• Invertebrates have many adaptations for survival.

• Some invertebrates are parasites,
animals that survive by living inside
or on another organism, get food
from the organism, and do not help
in the organism’s survival.

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