What is a shark?

This page has a boatload of information.

Read What is a Shark? Then write the answers to these questions on your paper:

1. How long have sharks been around?

2. What is their skeleton made of?

Read Teeth. Then write the answers to these questions on your paper:

1. How many teeth can a shark have at one time?

2. How many rows of teeth do most sharks have?

Comments

[Michael]

Too long.
The deaths of all they have consumed.
Enough to kill humans, isn't that all that matters?
too many.