Are They Among Us? Unit Lesson 2 Quiz

The 8 week old whale embryo has forelimbs and hind limbs. The hind limbs disappear in later development. What information can you gain from looking at the development of an embryo?

• the embryo development helps identify a relationship that is not always apparent when comparing adults
• the embryo shows that the adult whale will have four limbs
• the whale's embryo development is most likely the same as the frog's
• embryos are important in order to compare what environment the organism lives in

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The images represent the limbs of extinct organisms found in the fossil record.  Which order shows the letters of the fossil limbs from oldest (most ancient) to youngest (most recent).

• X, Z, W, Y

• Z, X, W, Y

• X, Z, Y, W

• W, Z, X, Y

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The scientists determine that the cat and the bat were probably related at some point in history. What evidence from the images best supports their claim?

• Bats and cats share some of their DNA.
• Wings are visible on the bat during its late embryonic stage.
• Cats and bats have similar structures during early stages of embryonic development.
• Cat embryos are smaller during early stages of development, then catch up with bats.

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Scientists are comparing the embryonic development of a gar (a type of fish), a bat, and a cat.  They have completed the table below to show the development of bat and cat embryos. Under which stage of development of the gar embryo would "A" be placed?

• Early embryonic stage

• Intermediate embryonic stage

• Late embryonic stage

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Scientists are comparing the embryonic development of a gar (a type of fish), a bat, and a cat.  They have completed the table below to show the development of bat and cat embryos. Under which stage of development of the gar embryo would "B" be placed?

• Early embryonic stage

• Intermediate embryonic stage

• Late embryonic stage

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Scientists are comparing the embryonic development of a gar (a type of fish), a bat, and a cat.  They have completed the table below to show the development of bat and cat embryos. Under which stage of development of the gar embryo would "C" be placed?

• Early embryonic stage

• Intermediate embryonic stage

• Late embryonic stage

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Marco comes across a picture of an archaeopteryx skeleton. He tries to determine if the archaeopteryx is more closely related to a chicken or a kangaroo by comparing their skeletal structures. Based on their skeletal structures, which is more closely related to the archaeopteryx: the chicken or the kangaroo?

• The archaeopteryx is likely more closely related to the chicken because both skeletal structures have similar long, S-shaped necks.
• The archaeopteryx is likely more closely related to the chicken because both skeletal structures have eye sockets.
• The archaeopteryx is likely more closely related to the kangaroo because both skeletal structures have tails.
• The archaeopteryx is likely more closely related to the kangaroo because both skeletal structures have distinct, finger-like bones.

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Scientists examining whale DNA evidence discovered something surprising: whales appear to be far more closely related to pigs than to fish! Help them evaluate anatomical, embryological, and newly uncovered fossil evidence, then decide if this evidence supports the claim that a whale is closely related to a pig. The scientists start by examining the skeletons of each species, shown below. Which two animals most likely share a more recent common ancestor?

• the pig and the whale
• the whale and the fish

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Select all of the statements that are true when comparing the skeletons of the pig to the whale.

• They have similar skulls made of cartilage
• Both have a spine
• Two limbs of the whale are different sizes, but all limbs on the pig are the same size
• Front limbs of the whale have shorter and wider bones than those of the pig
• There are many bones in the hind limbs of the whale while the pig has very few

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Select all of the statements that are true when comparing the skeletons of the whale to the fish.

• Both have front and back limbs/fins
• Both have a lot of bones in the spine
• The front limbs/fins are very narrow
• The fins of fish have lots of tiny bones all connected at the same point while the whale has a line of bones connected to each other
• Fish skull is in lots of tiny pieces while the whale skull is longer and pointed

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