1-a)List the defining characteristics of the Chondrichthyes. b) Draw a simplified phylogenetic tree for cartilaginous fishes...

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Biology

1-a)List the defining characteristics of the Chondrichthyes. b)Draw a simplified phylogenetic tree for cartilaginous fishes andoutline the characteristics of the three main types.
2- Describe the main evolutionary steps involved in the conquestof landmasses by vertebrate organisms during the Devonian period.

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Answer 1 a Defining Characteristic of theChondrichthyesEndoskeleton of soft and flexible cartilagelack the airfilled swim bladder which most of the bony fisheshave Therefore the Chondrichthyes must swim continuously to stayafloatThe Chondrichthyesis characterized by placoidscales also called dermal denticles or skin teeth with astructure similar to teeth consisting of an outer enamel layerdentine and an inner pulp cavity57 pairs of gills See Answer

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