Life Cycle - Organisms (3A)
Post Lab 

  • Exploring where marine invertebrates live.
  • Coloring exercise on sealife.
  • beach
  • benthos
  • deep ocean
  • nearshore
  • nekton
  • plankton

Students use research materials to find the color of marine organisms.


There are many picture books and websites on sealife that can help students to investigate the environments in which invertebrates live. The marine environment is rich with life but just like land, there are certain areas where specific animals prefer to live. These preferred areas can be called marine habitats. Some habitats can be on the beach, on the bottom of the sea floor (benthos), floating on the water (plankton) swimming (nekton), in the deep ocean or nearshore. Some organisms prefer warm water and others cold. Emphasize with students that organisms, even marine ones, live with other organisms in a community.

Throughout the world’s oceans there is a wealth of biological life. Students do not think of the oceans as habitats because they are covered with water. There are new lifestyles that students have not even thought about.


  1. Read with students, "Simona’s Nature Adventures in Eritrea, East Africa," by J.R. Blueford. This contrasts the organisms that live on the land versus those that live under the sea. It shows that along the seashore, there are clues of a vast undersea marine habitat.

    This might be a good time to talk about different beaches around the world and if clues of the organisms can be found. Some students may have found wonderful specimens along the beach, just like Simona found along the shores of the Red Sea.

  2. Give students the worksheet as a homework assignment. Ask students to try and find the true colors of each of the groups. Suggest going to the library, internet (do a search), or even television.
  3. Go over the range of colors that students come up with. Organisms from the sea are very colorful. Barnacle (pink - purple shell, living, white to pinkish); nautilus (browns);chiton (browns-bright colors); sea stars (oranges, reds, yellows, brown, pink, blue, most colors); snail (any color); lobster (red - orange); sea anemone (any color)

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