Identify the animal with following characteristics: 1. They are very simple. 2. They have a porous body. 3. Water flows in and out of the pores. 4. Oxygen and nutrients are absorbed directly through the water.
A
Echinoderms
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B
Insects
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C
Worms
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D
Sponges
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Solution
The correct option is D Sponges These are the characteristics of a sponge. Sponges have a very simple body and cells are loosely arranged. As the body is porous, water moves in and out freely. Oxygen and nutrients are absorbed through water directly.