I NOVA LABS The Evolution Lab / MISSION 2 Origin of whales: In the p Origin of w
ID: 199480 • Letter: I
Question
I NOVA LABS The Evolution Lab / MISSION 2 Origin of whales: In the p Origin of whales:In the previous level, you looked at the transtion from water to land and the evolution of tetrapods Several groups of tetrapods went on to make the reverse trip-they headed back to the water in this level. youll put together a tree that summarizes some of the changes that occurred as a group of mammals closely related to the modern-day hippopotamus, returned to the sea. Answer questions 10-12 below before you move on to Mission 3, "DNA Spells Evolution 10. When did whale ancestors begin living full time in the water? a. After they nursed under water b. After they lost their hind legs c. Before they evolved gills d. Before they began eating a carnivorous diet 11. Whales are tetrapods-but living whales do not have four limbs. What is a more accurate way to describe tetrapods? a. Animals that have at least two limbs b Animals that descended from a four-limbed ancestor c. Animals that have four limbs at some point in their lives d. Animals that evolved the ability to survive without limbs 12. When two groups of organisms independently evolve similar adaptations, it's called convergent evolution. Sharks and whales both have streamlined bodies and tail flukes. How do we know that these similarities are because of convergent evolution? Hint: Whales are tetrapods. Are sharks?Explanation / Answer
10. b
11. c
12.despite coming from completely different branches of the the animal kingdom sharks and whales look so similar because of the adoption of more fishy characteristics for more efficient swimming represents not just an example of divergent evolution, but convergent evolution as well.
Sharks are not tetrapods. Sharks are fish.
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