Chapter 11 Lesson 1 What defines an animal?

Which of the following is true about animals?

• They are multicellular organisms
• They are unicellular organisms
• They can be both multicellular and unicellular. 

Tags

NGSS.MS-LS1-1

Scientists estimate that there are about 500,000 known species of animals on Earth.

• True

• False

Animals can be classified according to whether or not they have a backbone.

• True

• False

A vertebrate is an animal that does not have a backbone.

• True

• False

Worms, spiders, and snails are examples of invertebrates.

• True

• False

Invertebrates make up about 95 percent of the animal kingdom.

• True

• False

Body parts arranged nearly the same way on both sides of the body are called _________.

• asymmetry

• bilateral symmetry

• vertebrate

• invertebrate

• Chordata

Only animal phylum that contains vertebrates is called _________.

• asymmetry

• bilateral symmetry

• vertebrate

• collagen

• Chordata

Tags

NGSS.MS-LS4-2

A protein that surrounds animal cells and helps them keep their shape is called _________.

• asymmetry

• bilateral symmetry

• vertebrate

• collagen

• Chordata

Tags

NGSS.MS-LS3-1

A worm is an example of a(n) ________ because it does not have a backbone.

• asymmetry

• radial symmetry

• bilateral symmetry

• vertebrate

• invertebrate