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- Amphioxus long has been of interest to zoologists searching for a vertebrate ancestor. Explain why amphioxus captured such interest and how it is different from the hypothesized most recent common ancestor of all vertebrates.What are the key evolutionary adaptations that diving mammals use to survive at significant ocean depths?Which of the following is the correct classification for the following chordate animal: This animal has a skeleton made of bone. Most modern day fish are in this group. They use gills to breathe and have a swim bladder to help control buoyancy. They also have a lateral line to detect vibrations in the water. Question 29 options: a) Superclass Agnatha b) Urodela / Salamanders c) Anura / Frogs d) Marsupial e) Class Osteichthyes f) Reptiles (non avian) g) Monotreme h) Birds i) Cephalochordata j) Eutharia k) Class Chondrichthyes
- Amphioxus 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.What does radial symmetry means? What is the type of symmetry found in chordates? Which are other phyla of the animal kingdom that present species with radial symmetry?Pharyngeal slits are which of the following? Question 24 options: a) Openings in the pharynx. In aquatic chordates they allow for exit of water that enters the mouth. b) Elongations of the posterior portion of the body. Use for locomotion in fish, or balance in some terrestrial vertebrates. c) Flexible, rod-shaped structures that grows from mesoderm. Gives support to an animal in embryonic development of chordates or for entire life depending on the species. d) Tissues that produces thyroid type hormones. e) Hollow tubes that develops from ectoderm. Develops into the central nervous system.
- Which of the following is the correct classification for this chordate animal: This vertebrate possesses hair and mammary glands. They are endothermic. This group gives birth to live young at a fetal stage. Most then nurture their young in a pouch. Question 31 options: a) Class Chondrichthyes b) Eutharia c) Cephalochordata d) Birds e) Urodela / Salamanders f) Class Osteichthyes g) Monotreme h) Reptiles (non avian) i) Anura / Frogs j) Superclass Agnatha k) MarsupialWhat evidence suggests that four-legged animals came from fish?What types of molecular and morphological changes occurred along the different branches that led to the ray-finned fish on the one hand and terrestrial tetrapods on the other?
- Can you answer all the parts to this question regarding the diagram Hemichordates are a sister group to the chordates. This group contains organisms called acorn worms. They don’t have all of the chordate characteristics - just some. Question Part a: What about the name hemichordate might give you a hint about their chordate characteristics? Part b: What characteristics do all chordates share based on this cladogram? Part c: Which ones are synapomorphies of the chordates and which ones are symplesiomorphies based on this cladogram?Within the subphylum Urochordata is a group called the appendicularians (or larvaceans; class Appendicularia). This relatively obscure group of organisms plays an important role in the global carbon cycle and other biogeochemical processes in the ocean. Use library and Internet resources to research the natural history of these unique invertebrate chordates. What do they eat? How do they capture food?Which of the following is the correct classification for this chordate animal: This vertebrate starts its life cycle in the water in a form without legs. the adult form is a tetrapod and lives mostly on land. These animals do not have a tail and they are specialized for movement like jumping to capture prey. Question 26 options: a) Birds b) Cephalochordata c) Monotreme d) Class Chondrichthyes e) Urodela / Salamanders f) Anura / Frogs g) Eutharia h) Reptiles (non avian) i) Marsupial j) Superclass Agnatha k) Class Osteichthyes