What is /are the most recent ancestor/s of the following: Modern Fishes Earliest amphibian (What group of fishes gave rise to earliest amphibians?) Earliest reptiles Earliest birds Earliest mammals Describe the morphological features of their ancestor/s briefly
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What is /are the most recent ancestor/s of the following:
- Modern Fishes
- Earliest amphibian (What group of fishes gave rise to earliest amphibians?)
- Earliest reptiles
- Earliest birds
- Earliest mammals
Describe the morphological features of their ancestor/s briefly.
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- What is /are the most recent ancestor/s of fishes, amphibians, reptiles, birds, and mammals.Describe the morphological features of the ancestor/s briefly.Amniotes are descended most closely from which of the following groups O reptiliomorphs O lepospondyls O batrachomorphs sauropodomorphs Vertebrates possess all the following synapomorphies except which? * O bone O ventral nerve cord O vertebrae O expansion of anterior nerve cord craniumDinosauria is divided into these two major clades * O theropods & ornithopods O crurotarsans & archosauriforms O saurischians & ornithodirans ornithischians & saurischians ornithischians & pseudosuchians
- Describe the evolution of mammals, tracing their synapsid lineage from early amniote ancestors to true mammals. How would you distinguish pelycosaurs, early therapsids, cynodonts, and mammals?The ancestors of extant tetrapods first evolved the ability to live out of water over 350 million years ago. Which of the following had to have been true for natural selection to have favored the original evolution of limbs? A) Closely related lineages that remained in the ocean must have gone extinct. There must have been differences in survival and or/reproduction based on size, musculature, bones or other (B functional aspects of early limbs. Large predators must have been a major source of mortality for populations that spent more time in the water and less on land. The ability of some ancestral fish-tetrapod transitional forms to move from one body of water to another during D droughts must have led to decreased mortality. E There must have been less competition for food on land.Lateral undulation is a type of locomotion used by many basal Chordates, but it is used by derived Chordates too. Choose all the clades that have taxa that use lateral undulation. O Crocodylia Mammalia Aves O Lepidosauria O Actinopterygii O Amphibia
- Consider the cladogram representing most of the major classes of animals. Consider the point A in the cladogram. What characteristic(s) might be used to separate fish from the other animals following in the cladogram? hale symmetnical ancestor O Endoskeleton O Non-terrestrial O Four legs or supports O The presence of scalesFill in the blanks with synapomorphic, symplesiomorphic, or neither Mesoderm is a ___ feature of chordates, and a ___ feature of vertebrates, but mesectoderm (neural crest) is a ___ feature of chordates, and a __ feature of vertebratesDuring chordate evolution, what is the sequence (from earliest to most recent) in which the following structures arose/evolved? 1 v [ Choose ] notochord gastrulation bilateral symmetry 2 true tissues deuterostome embryonic development (mouth then anus) 3 [ Choose ] 4 [ Choose ] [ Choose ]
- In vertebrates, what anatomical structure partially or completely replaces the notochord? 1.) lateral-line system 2.) cartilage or a bony skeleton 3.) endostyle 4.) dorsal hallow nerve cordAmphioxus long has been of interest to zoologists searching for a vertebrate ancestor. Explain why amphioxus captured such interest and why it no longer is considered to resemble closely the direct ancestor of the vertebrates.Which of the following is not considered a key characteristic of vertebrates? Backbone O jaws skull O vertebrae