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Biology Help Please, Insight Students Please Help!!!! ten points?

1. Which characteristic allows vertebrates to grow to large sizes? A. Presence of a braincase B. Absence of a braincase C. Presence of an endoskeleton D. Presence of an exoskeleton 2. The earliest vertebrates were A. fish. B. amphibians. C. mammals. D. reptiles. 3. A major difference between a hagfish and more evolved vertebrates is that it A. is protected by a thick bony shell. B. has a skeleton made of cartilage. C. it does not have vertebrae. D. lays eggs that can develop out of water. 4. What four features do all chordates share at some point during development? A. Notochord, hollow nerve cord, pharyngeal slits, and tail B. Hollow nerve cord, jaws, tail, and pharyngeal slits C. Tail, spinal cord, pharyngeal slits, and fins D. Jaws, tail, fins, and notochord 5. Which term refers to an internal skeleton built of bone or cartilage? A. Exoskeleton B. Vertebrae C. Endoskeleton D. Notochord 6. Ray-finned fish make up nearly half of all A. cartilaginous fish. B. living placoderms. C. vertebrate species. D. sea-dwelling species. 7. Which of the following characteristics helps a fish float higher or lower in the water? A. Flattened body B. Lobe fins C. Ray fins D. Swim bladder 8. Lobe-finned fish were able to become the ancestors of all terrestrial vertebrates because their fins A. make the fish very fast swimmers. B. help the fish easily move around in the water. C. are excellent at supporting weight. D. can change shape faster than ray fins. 9. What structural element makes the fins of ray-finned fish so maneuverable? A. Their round, fleshy shape B. A fan-shaped array of bones C. The muscles extending into the fin D. A branching series of bony struts 10. Recent studies of mitochondrial DNA suggest that lungfish might be the closest living relatives of A. most bony fish. B. terrestrial vertebrates. C. extinct coelacanths. D. ray-finned fish. 11. A tetrapod is a vertebrate that has A. four limbs. B. extra gills. C. lateral lines. D. a swim bladder. 12. Where do caecilians live? A. Underwater B. Along shorelines C. In tropical trees D. Underground 13. Which animals make up the largest group of living amphibians? A. Frogs B. Salamanders C. Lizards D. Caecilians 14. All amphibians need a source of water to A. breathe. B. reproduce. C. feed. D. move around. 15. What process must tadpoles undergo to grow into terrestrial adults? A. Fertilization B. Metamorphosis C. Photosynthesis D. Egg-hatching 16. Keratin is a protein in skin cells that forms a A. semi-porous layer. B. hydrophobic layer. C. permeable layer. D. hydroponic layer. 17. Which phrase best describes an amniotic egg? A. A membranous organ that lines the mother's uterine wall B. A water repellent layer that holds the embryo C. An organ that carries nutrients from mother to embryo D. A mostly waterproof container that protects the embryo 18. What is the term for an animal with a thin, tough, membranous embryonic sac? A. Amphibian B. Arthropod C. Amniote D. Crustacean 19. The chief function of an amniotic egg is to A. prevent the embryo from drying out as it develops. B. deliver nutrients to the fetus from the mother's blood. C. stay inside the animal's oviduct to avoid predators. D. enable the embryo to adjust to life on dry land. 20. The increased surface area of which organs enables amniotes to absorb more water internally than amphibians? A. Placenta, bladder, and uterus B. Kidneys and large intestines C. Gall bladder and kidneys D. Pancreas, spleen, and liver 21. The gills of a fish serve what essential function? A. Keep the fish stable in water B. Return blood to the heart C. Take in oxygen from water D. Prevent countercurrent flow 22. From which structure did jaws evolve? A. Antennae B. Gill arches C. Front legs D. Notochord 23. The two remaining groups of jawed fish that still exist are the Osteichthyes and the A. Agnatha. B. Placoderms. C. Chondrichthyes. D. Acanthodians. 24. How did the development of jaws affect vertebrates? A. Improved their ability to filter-feed B. Gave them a huge advantage as predators C. Enabled them to obtain nutrients from coral D. Made them more streamlined and thus faster 25. A sensory system used by fish to detect the movements of other fish in the water is called the A. countercurrent flow. B. operculum. C. lateral line. D. swim bladder.

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1. 1. Which characteristic allows vertebrates to grow to large sizes? C. Presence of an endoskeleton 2. The earliest vertebrates were Of these, A. fish. The earliest vertebrates were probably not fish, though. 3. A major difference between a hagfish and more evolved vertebrates is that it C. it does not have vertebrae. 4. What four features do all chordates share at some point during development? A. Notochord, hollow nerve cord, pharyngeal slits, and tail 5. Which term refers to an internal skeleton built of bone or cartilage? None of those, but here's the answer your teacher wants: C. Endoskeleton 6. Ray-finned fish make up nearly half of all C. vertebrate species. Yeah, I'm surprised by that too. This isn't the "age of mammals" after all. 7. Which of the following characteristics helps a fish float higher or lower in the water? D. Swim bladder 8. Lobe-finned fish were able to become the ancestors of all terrestrial vertebrates because their fins C. are excellent at supporting weight. 9. What structural element makes the fins of ray-finned fish so maneuverable? Um, I don't know. Probably B. A fan-shaped array of bones 10. Recent studies of mitochondrial DNA suggest that lungfish might be the closest living relatives of B. terrestrial vertebrates. 11. A tetrapod is a vertebrate that has A. four limbs. 12. Where do caecilians live? D. Underground 13. Which animals make up the largest group of living amphibians? Order Anura, which includes A. Frogs 14. All amphibians need a source of water to I don't like any of these answers. Put: B. reproduce. 15. What process must tadpoles undergo to grow into terrestrial adults? B. Metamorphosis 16. Keratin is a protein in skin cells that forms a Um I don't know. I am going to guess: B. hydrophobic layer. 17. Which phrase best describes an amniotic egg? D. A mostly waterproof container that protects the embryo 18. What is the term for an animal with a thin, tough, membranous embryonic sac? C. Amniote 19. The chief function of an amniotic egg is to A. prevent the embryo from drying out as it develops. 20. The increased surface area of which organs enables amniotes to absorb more water internally than amphibians? I have absolutely no idea, and I think the question is bad. If I had to answer this question I'd put: B. Kidneys and large intestines 21. The gills of a fish serve what essential function? C. Take in oxygen from water 22. From which structure did jaws evolve? Um... hm. B. Gill arches 23. The two remaining groups of jawed fish that still exist are the Osteichthyes and the C. Chondrichthyes. 24. How did the development of jaws affect vertebrates? B. Gave them a huge advantage as predators 25. A sensory system used by fish to detect the movements of other fish in the water is called the C. lateral line.