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Download PDF by Penny Dowdy: Animal Cells

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A chameleon can not only think, hunt, eat, and reproduce; it can also change color. Other animals are simple. Some do not even move. Yet they eat, grow, and reproduce. Sponges and Cnidarians Sponges live at the bottom of the ocean. Most attach themselves to some hard surface, such as a rock. Then they take in nourishment from the water and debris on the ocean floor. Some sponges are quite small. Others can grow much larger. The barrel sponge, for example, is big enough for a person to fit inside of it.

These simple, yet amazing, animals can reproduce asexually or sexually. Jellyfish have more kinds of cells than sponges do. One Old Sponge Sponges may have been one of the earliest animals to develop on Earth. How do we know? The oldest producing oil field in the world (in Oman, east of Saudi Arabia) has chemicals that can be linked to sponges. These early sponges probably lived about 600 million years ago. 31 Complex Animals We know many examples of animals far more complex than sponges and cnidarians.

1. Prophase I DNA shortens and thickens to form chromosomes. Pairs of similar chromosomes line up tightly beside each other. The nuclear membrane disappears. Centrioles move to opposite ends of the cell. anaphase 1 2. Metaphase I Long fibers extend from the centrioles and attach themselves to the chromosomes. The chromosomes line up in the center of the cell. telophase 1 cytokinesis 1 3. Anaphase I The fibers shorten and pull one of the matching pairs of chromosomes toward opposite ends of the cell.

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Animal Cells by Penny Dowdy


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