edHelper.com Animal Themes Invertebrates

Invertebrates

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Invertebrates
Reading Level

	edHelper's suggested reading level:	grades 4 to 8
	Flesch-Kincaid grade level:	9.42

Vocabulary

challenging words:

annelid, cnidarians, exoskeletons, harpoon-like, hydraulic, millipedes, myriapods, nematodes, nerveless, ribbon-like, threadworms, vascular, woodlice, qualify, unbearable, highly

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Invertebrates

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¹     With over 2 million known animal species on Earth, 98% of them are invertebrates. Invertebrates are animals that don't have backbones. They live in a variety of environments, from hot and unbearable deserts to frigid and equally unbearable polar regions. They also come in an assortment of shapes and colors. To better understand invertebrates, scientists group them into eight major categories. Here are the categories and a fact or two about each category:
 
²     Arthropods are invertebrates with hard outer shells (exoskeletons), with jointed legs, and with segmented bodies. Since about 75% of all animal species are arthropods, they represent the largest invertebrate group. Insects (such as butterflies, fleas, and beetles), myriapods (such as centipedes and millipedes), crustaceans (such as crabs, pill woodlice, and lobsters), arachnids (such as spiders, scorpions, and ticks), and horseshoe crabs are all examples of arthropods.
 
³     Sponges are the simplest of all animals. Inhabiting mostly oceans but occasionally freshwater, they are headless and nerveless. As their movement is very difficult to detect, and they always attach to rocks, sponges were once thought to be aquatic plants! Sponges feed through a filter system. Thousands of pores covering the outside of a sponge pump water into the sponge's body. Collar cells lining the inside of the sponge sort out planktons or other microorganisms from the water. Once food particles are trapped and digested by collar cells, sponges expel the water through an opening at the top of the sponge.

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Animal Themes

Animal Themes

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Invertebrates

Invertebrates

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Animals

Amphibians         Birds         Deserts         Fish         Freshwater         Grasslands         Insects

Invertebrates         Mammals         Oceans         Polar Regions         Rain Forest         Reptiles

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