VILLALOBOS,+LUIS+A

=Jellyfish= =by Luis Angel Villalobos= = = =Table of Contents= 1..................................Introduction 2..................................What is a jellyfish? 3..................................Growing up 4..................................What can they do 5............................................Conclusion 6.............................................Bibliography

1. Introduction

What you are gonna learn today is that there is one weird fish that is not really a fish but called a jellyfish. This unusual animal can be found almost anywhere in oceans, lakes, and ponds. Many jellyfish can be freshwater and saltwater. Jellyfish might not have no brains, no hearts, and no bones. Yet they managed to live in waters on earth for more than 650 million years, long before dinosaurs roamed the earth jellyfish have floated in these seas. Jellyfish can rang in size from less than 1 inch ( 3 centimeters ) across to about 7 feet ( 2 meters ). Jellyfish come in a variety of shapes, sizes, and colors.

2. What is a jellyfish?

The jellyfish is not a fish. It got its name because its body is shiny and smooth and squishy, like jelly, and it lives in the sea, like a fish. Jellyfish come in a variety of shapes, sizes, and colors, even most jellyfish are shaped like umbrellas, or upside-down bowls. They have arms called tentacles, these tentacles hang down in a fringe. Some tentacles are short and stubby, and others are long and thin, likr silvery hairs. Only a few jellyfish have tentacles one hundred feet long. Jellyfish swim by squeezing water throught their bodies, but they can't swim very fast. most of the time they just drift along, letting the sea carry them wherever it will. Most jellyfish names tell how the jellyfish looks like this box jellyfish. The jellyfish has many relatives are the anemone and the coral animal. Anemones look like plants, but they are animals fastened to a rock on the seafloor.

3. Growing up A jellyfish begins life as an egg. In just a few days each egg becomes a tiny animal and it looks like worm. But actually this first part of a jellyfish's life is called a planula (PLAN-yoo-luh). A planula is transparent. It can swim, but mostly it just floats. After a few days or weeks, the planula sinks to the bottom and very soon it grows into a polyp (POL-ip). A polyp has a mouth and tentacles. But a polyp cannot swim. It is stuck to the bottom of the ocean and it stings prey animals that swims near it. It holds the prey with its tentacles and then, a few days small disks, shaped like saucers, begin to grow from the polyp. By the end end of a year, a polyp has many disks and then the disks break off. Then the disks float for about one week. By the end of a week, each disk has become a medusa (muh- DOO-suh). Usually some medusas are eaten by predators and some wash onto beaches and die. Most medusas liv for about one year.

4. What can they do?

As you know jellyfish has no brain but, it does have nerves. These nerves send messages through the jellyfish's body and it can tell the jellyfish when other animals are near it. It can tell up from up and down. They might not have bones but, it does muscles. It uses its muscles for swimming and eating. The body of a jellyfish is called a bell. A jellyfish swims by squeezing its bell but, first the jellyfish lets water into its bell. then the jelly squeezes muscles in its bell and then water rushes out. then the jelly shoots ahead. A jellyfish has eyes around the bottom of its bell and the eyes can tell the difference between light and dark. A jellyfish's mouth is beneath its bell. wavy bands hang down from the mouth. The bands are called oral lobes. The jellyfish also have tentacles (TEN-tuh-kuhlz). the tentacles stream down from the edge of the bell. Some jellies have short tentacels and others have long tentacles that can sting you.

5. Conclusion

I hope you learned something today. You must always rememeber never ever estimate a jellyfish because there is small detail I forgot to include there is a jellyfidh called the box jellyfish if it stings you adios amigo you might end up dead so, you better hope that the hospital has anti-venom for that sting. thats all.

6. Bibliography

The book that I used for the project was Jellyfish by Leighton Taylor and photograps by Norbert Wu and thats all.