'800 species' presentation slideshows

Chapter 33

Chapter 33. Invertebrates. Fig. 33-1. Overview: Life Without a Backbone. Invertebrates are animals that lack a backbone They account for 95% of known animal species. Fig. 33-2. Calcarea and Silicea. ANCESTRAL PROTIST. Cnidaria. Lophotrochozoa. Common ancestor of all animals.

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Fig. 33-1

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Fig. 33-1

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Chapter 33

Chapter 33. Invertebrates. Figure 33.1. Overview: Life Without a Backbone Invertebrates Are animals that lack a backbone Account for 95% of known animal species. Porifera. Cnidaria. Chordata. Echinodermata. Other bilaterians (including Nematoda, Arthropoda, Mollusca, and Annelida).

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Chapter 33

Chapter 33. Invertebrates. Figure 33.1. Overview: Life Without a Backbone Invertebrates Are animals that lack a backbone Account for 95% of known animal species. Porifera. Cnidaria. Chordata. Echinodermata. Other bilaterians (including Nematoda, Arthropoda, Mollusca, and Annelida).

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