Homework Fossils - Pages

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1 Homework Fossils - Pages Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. 1. Scientists can date fossils directly. _ 2. In an undisturbed rock formation, the rocks on the bottom are the oldest. _ 3. B is a mold of A. This resembles one kind of fossil formation. _ 4. These are analogous structures because they look different but are similar in origin. _ 5. These are homologous structures because they are from different origins, but look and act alike. _

2 6. Suppose this continent pulls apart as shown by the arrows. After a few million years, the trees at A are likely to be extinct because they can t adapt to the change in climate. _ Multiple Choice Identify the choice that best completes the statement or answers the question. 1. In the trashcan in Isaac s room, there were many wrappers from snacks. At the bottom of the trash there was a candybar wrapper. In the middle, there was a peace of plastic from a slice of cheese. On the top of the rest of the trash is a granola bar wrapper. Assuming the trash has never been mixed up, which snack did Isaac eat the longest ago? Which type of dating did you use to answer? a. the granola bar; absolute-age dating b. the granola bar; relative-age dating c. the candy bar; absolute-age dating d. the candy bar; relative-age dating 2. are remains of life from an earlier time. a. Sedimentary rocks c. Variations b. Fossils d. Limestones 3. Which of the following is NOT a fossil? a. outline of a fern found in a rock c. baby mammoth found in a glacier b. petrified wood in the desert d. old stone tools found in a cave 4. Students are observing two fossils in the classroom. All the students know about the fossils is that one was found in a different layer of rock than the other one. Which could the students MOST likely determine about the organisms by observing both fossils in the classroom? a. how each organism died b. the exact age of each fossil c. if the organisms had similar structures

3 d. other organisms that lived at the same time 5. Paleontologists have found hundreds of fossils of tropical plants in cool, dry areas of North America. Which is MOST likely indicated by fossil discoveries like these? a. Glacial movement carried fossils to different places. b. Some tropical plants can grow in moderate climates. c. The climate in different areas on Earth has changed over time. d. Ancient people carried plants with them as they traveled to new locations. 6. Pterosaurs were ancient winged reptiles. The drawing of the pterosaur shown is based on fossil finds. The first known pterosaur fossils are about 195 million years old. These early pterosaurs had wingspans of approximately 1 meter. Similar fossils from about 136 million years ago show flying reptiles with wingspans of up to 12 meters. Which is the BEST conclusion based on the description of the fossils? a. The later fossils were a different class of animal. b. As time passed, birds became more abundant than reptiles. c. As time passed, food sources for pterosaurs became scarce. d. Larger pterosaurs were better adapted to changes in the environment. 7. Horses have one of the most complete fossil records of any living organism. Some species of horses are shown, along with an approximate time of when they lived. It is hypothesized that all these horses are closely related to each other.

4 Which is the BEST conclusion that can be made about these horses over time? a. Beneficial gene mutations resulted in physical changes to the horses. b. Dietary changes caused the physical appearance of the horses to change. c. The environments in which the horses have lived have remained unchanged. d. Horses began to change in response to changes to other organisms in their ecosystems. Completion Complete each statement. 1. Footprints formed in mud that later turned to rock are called fossils. 2. A fossil shows the activity of an organism. 3. A(n) extinction occurs when many species become extinct in a relatively short amount of time.

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