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Life in the Ocean

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Life in the Ocean - Page Text Content

FC: Life in the Ocean | A 4th Grade Science Book

1: The ocean covers more of our planet than dry land does and yet we know more about outer space than this underwater world. Let's take a closer look at the creatures that inhabit this watery world.

2: Life in the Ocean Whether it is a fish, marine mammal, cephalopod, crustacean or even an aquatic plant...the ocean is home.

3: There are 230,000 known species in the ocean but it is thought that there are millions more waiting to be discovered.

4: Fish There are three main kinds of fish: jawless (such as the hagfish) bony (about 90 percent of fish are this) cartilaginous (such as a shark) | Fish are typically cold blooded but some can hold a higher body temperature than others.

5: Don't think: Look! -Ludwig Wittgenstein | Fish can range in size from less than an inch to 52 feet

6: Marine Mammals Whales, Polar bears, Seals, Sea Lions, Otters and Walruses | There are about 128 species of marine mammals. They differ from one another on how much they depend on the ocean. Some live completely in the water while others may travel and breed on land but their main source of food is from the ocean.

7: All marine mammals have some sort of hair on their body, give birth to live young and feed their young milk. | Most marine mammals have teeth and are called odontocetes. The largest of the marine mammals use baleen to trap their food and have no teeth.

8: There is something of the marvelous in all things of nature. -Aristotle

9: Cephalopod This group includes the octopus, squid, cuttlefish and the nautilus | Cephalopods have no bones, large eyes and are thought to be the smartest of the invertebrates.

10: Crustaceans There are more than 67,000 species of crustaceans known. These include the lobster, crawfish, crab, shrimp, krill and barnacle.

11: Crustaceans can range in size from the smallest barnacle to the Japanese crab which can have a leg span up to 12 feet across. Some crustaceans can't even swim as in the case of the coconut crab.

12: Aquatic Plants These plants not only help keep our ocean clean, they provide food and shelter for many animals, and even medicines for us land lovers.

13: Never a day passes but that I do myself the honor to commune with some of nature's varied forms. -George Washington Carver

15: Photo Credits go to :,

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  • By: Kathlyn G.
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  • Title: Life in the Ocean
  • a 4th Grade Science Book
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  • Published: over 5 years ago