![]() Sponges can reproduce sexually and asexually. Sponges filter microscopic food particles such as bacteria, algae, protists, and other materials from the water as it is pulled in through their pores.Īnimals that produce sperm and eggs in the same body. What's the function collar cell's flagella? ![]() have no tissues or organ have many small openings called pores two cell layers, inside called collar cells have sharp, pointed structures called spicules skeletons of a fibrous material called spongin As microscopes were improved, scientists observed that sponges couldn't make their own food, so sponges were reclassified as animals Why did early scientists classify sponges as plants?Įarly scientists classified sponges as plants because they didn't move. ![]() Organisms that remain attached to one place during their lifetimes are called sessile can be smaller than a marble or larger than a compact car The colors, shapes and sizes of sponges vary.Ĥ. most of 5000 species of sponges are found in warm, shallow salt water near coastlineĢ. Fossil evidence shows that the sponges appeared on Earth about 600 millions years ago.ġ. ![]()
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