Are the following questions True or False? 10) At their first appearance in the
ID: 55526 • Letter: A
Question
Are the following questions True or False?
10) At their first appearance in the fossil record, osteichthyans, the largest vertebrate taxon, are separable into distinct lineages: the Sarcopterygii (fleshy-finned fishes) and the Actinopterygii (ray-finned fishes).
11) Freshwater teleosts generally produce and care for a relative small number of large, yolk-rich demersal eggs.
12) The elasmobranchs first appear in the fossil record in the late Silurian and are distinguished by a bony endoskeleton.
13) Elasmobranchs probably evolved internal fertilization in the Paleozoic.
14) Skates and rays are derived from the extant shark radiation and are adapted for life on the sea bottom.
15) In regional heterothermic fishes some parts of their bodies are maintained at temperatures 15 C warmer than the water they are swimming in.
16) Cladistics recognizes only groups of organisms that are related by distant descent.
17) The fossil record is no longer useful in modern biology, because DNA sequencing and molecular clocks provide the same information much more accurately.
18) Vertebrates are members of the phylum Chordata, a group of animals whose other memberstunicates and lanceletsare quite different from most modern vertebrates, being small, marine, and sluggish or entirely sessile as adults.
19) Specialization of feeding mechanisms is a key feature of the evolution of the Actinopterygii and Sarcopterygii.
20) Fossil evidence indicates that vertebrates evolved in a freshwater environment and had appeared by the Early Cambrian.
21) The early radiation of jawed fishes, first known in detail from the fossil record in the Late Silurian, included four major groups. Two groups, the chondrichthyans and osteichthyans survive today.
22) In fishes with swim bladders, the rete mirabile moves gas especially oxygen from the blood to the gas bladder.
23) A swimming fish experiences drag of two forms: viscous drag from friction between the fish’s body and water, and inertial drag from pressure differences created by the fish’s blood.
24) Chordates are distinguished from other organisms by the presence of a notochord, a ventral solid nerve chord, a muscular postanal tail, and an endostyle.
25) A pattern of fragmentation—coalescence—fragmentation has resulted in the isolation and renewed contact of major groups of vertebrates on a worldwide scale.
Explanation / Answer
10. True
11. True
12. True
13.False - Mezoic
14. True.
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