Classification

The biosphere is the part of the Earth that

• is land

• is living

• can support living things.

• has the most living things.

Choose the words that BEST complete the sentence.

Each organism in the biosphere __________________ with other organisms and the ____________________.

• competes, land

• interacts, ocean

• interacts, environment

• competes, environment

Which of the following describes an adaptation?

• A dog mates with another dog.

• A cactus stores water in its stem.

• A horse looks exactly like anotehr horse.

• A paramecium reproduces by cellular division.

What important characteristic do scientists use to group organisms in a species?

• their eating habits

• similarities in there appearance

• the environment in which they live

• their ability to mate with one another

Why is it easy to recognize members of the echinoderm phylum?

• They have tentacles.

• They are segmented.

• They have five parts.

• They are fan-shaped.

The series below shows how kingdoms of organisms are divided into smaller groups.

Kingdom > Phylum > Class > Order > Family > Genus > Species

In which group would organisms have very similar characteristics but cannot mate with one another?

• Class

• Genus

• Family

• Species

How do the cells of bacteria differ from those of other organisms?

• Bacteria cells need oxygen.

• Bacteria cells are much larger.

• Bacteria cells have no nucleus.

• Bacteria cells need carbon dioxide.

Scientists classify organisms by using three main characteristics: the structure of the organism, how it reproduces, and how it

• feeds.

• fights.

• nurses.

• moves.

Which of the following are classified as Chordates?

• insects

• arthropods

• vertebrates

• invertebrates

What do most nonvascular plants have in common?

• They produce flowers.

• They have short tubes and stems.

• They are larger than vascular plants.

• They are smaller than vascular plants.