G8Unit5 Part2

During the Cretaceous Period, reptiles were the dominant species, and dinosaurs ruled the Earth. Plants developed flowers and fruits. At the end of the Cretaceous Period, about 65 millions years ago, 50% of the plants and animals on Earth became extinct and dinosaurs were never to be seen again.

What is thought to have caused the mass extinction at the end of the Cretaceous Period?

• global warming

• an asteroid hitting Earth in Meixco

• extensive volcanic activity world-wide

• the start of glaciation and climatic changes

Tags

NGSS.MS-LS4-1

It is believed that the mass extinction at the end of the Cretaceous Period was caused by an asteroid hitting Earth in Mexico.Many organisms died immediately, other died because of lack of sunlight. Huge clouds of dust filled the atmosphere, blocking sunlight from the Earth's surface.

During Precambrian Time, simple life forms existed in the oceans of Earth. This was followed, during the Paleozoic Era, by the "great _______ explosion" when many new life forms appeared on Earth in a very short period of time.

• Burgess

• Cambrian

• Geologic

• Jurassic

Tags

NGSS.MS-LS4-1

Not all fossils are preserved shaped or bodies of organisms. The burrows of these early crustaceans that once lived during the Jurassic Period are examples of _____ fossils.

• concrete

• index

• trace

• trail

Two species of marine mammals have become extinct in modern times. The Atlantic gray whale and the stellar sea cow both joined the extinct species list back in the 1800s. More recently, scientists have declared the Caribbean monk seal to. be extinct.

• deforestation

• global warming

• over-hunting by man

• a drop in sevel

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-1

NGSS.MS-LS2-4

On the geologic time scale, which division would encompass the SHORTEST period of time?

• eon

• epoch

• era

• period

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NGSS.MS-ESS1-4

A team of archeologists excavating a sedimentary rock layer come across some primitive hunting tools used by early humans. As the dig progressives, they unearth the fossilization remains of a dinosaur from another layer of the sedimentary rock. Why do these discoveries indicate that the rocks were formed over millions of years?

• Early humans appeared on Earth about a million year ago

• Humans and dinosaurs coexisted about a million year ago

• Dinosaurs became extinct millions of years before humans appeared

• Humans hunted dinosaurs and were responsible for their extinction

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

In the warm southwest United States rabbits are brow and have long ears. In polar regions rabbits are white and have shorter ears.

• the white fur is more attractive

• the white fur camouflauges them in the snow

• the white fur reflects more light warming the rabbit

• the white fur makes the rabbits stand out in the snow

Tags

NGSS.MS-LS2-4

NGSS.MS-LS4-4

The tundra is cold year-round, it has short cool summers and long, severe winters. The tundra has permanently frozen sublayer of soil called permafrost. Like the desert, the tundra receives little precipitation, about 4-10 inches per year, and what does fall is usually in the form of snow or ice. It has long days during the growing season, sometimes with 24 hours of daylight, and long nights during the winter.

Which adaptations would you expect to see in plants growing in the tundra?

• leaves with hair help shade the plant, reducing water loss

• small and grow in clumps for protective from the wind and cold

• deep roots to help capture nutrients from deep below the surface

• tall plants with broad, thin, and waxy leaves so water easily runs off

Tags

NGSS.MS-LS1-5

NGSS.MS-LS4-4

Many years ago, during the Ice Age, sheets of ice moved over much of the land. It was dark and much colder than ever before. Ice and snow caused habitat destruction. The animals that lost their habitats MOST LIKELY

• moved to warmer places

• quickly changed to live in cold and ice

• stayed buried and lived again when the ice melted

• died out because they were not adapted to such cold

Tags

NGSS.MS-LS2-4

NGSS.MS-LS4-4

Several teeth were found in an area of flat land covered with trees and plants. The teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. They found many other shark teeth in this area. However, the people who discovered the teeth were puzzled. There was no source of water near where the fossils were found.

What is the paleontologist's BEST explanation for why the teeth were found in this area?

• Sharks used to live on flat land

• This area was once covered with salt water

• This area was once covered with freshwater

• Someone buried the shark teether deep in the ground

Tags

NGSS.MS-ESS2-3

NGSS.MS-LS4-1