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Lecture 13
Vertebrates
Term | Definition |
---|---|
What structure did jaws evolve from? | Gills. |
What are the skeletons of skates, rays and shark made of? | Cartilage. |
Sharks have electroreceptors that function to: | Detect weak electric currents from animals. |
Sharks do not have swim bladders, so how do they maintain buoyancy? | Large amounts of oil in liver. |
What would happen if a hammerhead shark stopped swimming and why? | It would drown because they need to push the water past their gills to breathe. |
What structure helps bony fish float or sink in the water? | Swim bladder. |
What are three obstacles animals faced when evolving to move on to dry land? | Dehydration, less support against gravity, sensory systems not adapted to air. |
Three advantages for animals to evolve to move on to dry land. | Plants available for food, more oxygen in air than water, no predators. |
What animal is said to be the common ancestor for all land animals? | The tiktaalik. |
Frogs and salamanders are modern day amphibians and they breathe through their: | Skin. |
What are two reasons amphibians need to live near water? | Must remain moist, eggs are hatched in water. |
Three reasons why amniotes evolved to live on land completely: | Tough, dry skin to prevent dehydration, amniotic egg that allows the egg to survive outside of water, semisolid waste allows an animal to conserve water. |
Three characteristics of mammals: | Have glandular skin covered in hair or fur, give birth to live young that feed on milk produced by their mother, endothermic - use body heat to maintain temperature. |
Three characteristics of the clade reptilia: | Dry, scaly, nonglandular skin without hair or fur, most lay eggs that can survive on land, none produce milk. |
What are five examples of animals that are in the clade reptilia? | Lizards, snakes, turtles, crocodiles, birds. |
How do snakes regulate body temperature? | Through behavior – get into sun to warm up and shade to cool down. |
Can a turtle come out of its shell and live? | No, because the shell is part of the skeleton. |
What purpose (other than flight) do feathers serve for birds? | Insulation. |
What is the unusual characteristic of a marsupial? | Baby continues to develop in a pouch on the mother. |
How does a fetus get nourishment in placental animals? | From placenta in the mother. |
Alligators: | Snout is wider than a crocodile's and are much darker than a crocodile. |
Crocodiles: | Snout is more narrow and V-shaped and they are lighter than an alligator. |