Are the following statments True or false 16) Cladistics recognizes only groups
ID: 55533 • Letter: A
Question
Are the following statments True or false
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
16. False, Cladistics is categorised based on the shared derived characteristics which amomg the most common recent ancestor.
17. False. Fossil records are still being used.
18. True. Tunicates are primitive marine animals.
19. False.
20. True.
21. True.
22. False. Rete mirabile is used as heat exchanger.
23. False. the viscous darg is true, but the inertial drag is due to the pressure of water from all sides of the fish body.
24. True
25. False
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