Dolphins are mammals that share several characteristics with humans, such as breathing air, giving live birth, and nursing their young. There are over 35 species of dolphins, which can be found worldwide in both salt and fresh water. Dolphins are part of the whale family but are smaller in size, ranging from 7 to 13 feet long. They can be various colors, including white, black, and gray. Like bats, dolphins use echolocation to navigate and hunt. Most dolphin species have a single type of tooth, known as homodont dentition.

Which of the following is a characteristic that dolphins share with humans?

• They lay eggs.

• They are cold-blooded.

• They breathe air.

• They have scales.

How many species of dolphins are there?

• More than 20

• More than 10

• More than 35

• More than 50

In what type of water can dolphins live?

• Both salt and fresh water

• Only brackish water

• Only fresh water

• Only salt water

What is the maximum length a dolphin can reach?

• 20 feet

• 10 feet

• 13 feet

• 15 feet

What method do dolphins use to navigate and hunt?

• Radar

• Sonar

• Echolocation

• Infrared