Question

12) Based on the information in the passage, which of these is an incorrect statement?
A) Dinosaurs evolved into mammals.
B) Dinosaurs vanished 65 million years ago.
C) Dinosaurs were on Earth for 150 million years.
D) Dinosaurs were the dominant life form on earth when they existed.

13) According to viewpoint #2
A) the impact of an asteroid colliding with Earth lead to dramatic climatic change.
B) forest fires caused by an asteroid impact with the Earth led to a mass extinction that included the dinosaurs.
C) the shift in climatic conditions caused by an asteroid collision with the Earth led to a mass extinction that included the dinosaurs.
D) the gas and dust in the atmosphere caused by an asteroid collision with the Earth led to a mass extinction that included the dinosaurs.

14) Viewpoint #1 and Viewpoint #2 agree that
A) evolution contributed to the extinction of the dinosaurs.
B) climate change contributed to the extinction of the dinosaurs.
C) continental drift contributed to the extinction of the dinosaurs.
D) forces from outside the Earth contributed to the extinction of the dinosaurs.

15) What evidence best supports viewpoint #3?
A) Fossils of two similar dinosaurs were found in Montana.
B) A layer of ash is found around the word in the sedimentary rock record.
C) Fossils from the same species were found in western Africa and eastern South America.
D) A volcano on an island in the Pacific erupts and the global temperature is lower for two years.

Answer 1

What Killed the Dinosaurs?
Patty Gordon

Dinosaurs dominated life on Earth for more than 150 million years. In fact, during their reign, other animal species had little chance of playing anything other than secondary roles to the dinosaurs. Then, 65 million years ago they vanished. There are several hypotheses about the disappearance of these “great lizards.” Here are three:

Viewpoint #1 - Volcanism
Massive deposits of ancient lava found throughout the world depict an Earth 65 million-years ago where massive volcanic eruptions were commonplace. Lava flows, like those found in the Deccan region of India, reveal a 500,000 year period of active volcanism; a time in which massive amounts of smoke and ash were spewed into Earth’s atmosphere. This global volcanic activity prevented sunlight from reaching Earth’s surface. With the decrease in available sunlight, temperatures around the globe dropped significantly. Plant life declined and photosynthetic activities dropped sharply. Very few species could escape the effects of a perpetually darkened sky and the drastic loss of producers in food webs everywhere on Earth. Dinosaurs as well as many other species could not survive the harsh changes on Earth. In fact, 70% of life on Earth perished at this time.

Viewpoint #2 – Impact theory
65-million-years ago a 10-kilometer asteroid struck Earth near the Yucatan Peninsula. The force of the asteroid is estimated to have been equal to that of three hundred million atomic bombs. Earth’s atmosphere filled with gas and dust from the asteroid’s impact, as well as with ash and smoke from resulting forest fires. Temperatures on Earth, as well as available sunlight, dropped dramatically. Plant life died and, as a result of this, so did many other species on Earth. When the dust and ash settled greenhouse gases, released as a result of the asteroid impact, caused temperatures to rise much higher than the average temperatures of pre-impact Earth. This shift in climatic conditions eventually resulted in the extinction of over 70% of all the species once living on Earth.

Viewpoint #3 – Continental drift
Some scientists believe that the slow repositioning of Earth’s landmasses lead to the extinction of dinosaurs. Convection currents within the Earth’s mantle caused landmasses to drift, collide, and eventually heave upward. Ocean currents were redirected and sea levels throughout the planet dropped. For example, the interior seaway, which once divided North America, drained away as the Colorado Plateau rose thousands of feet into the air. Without shallow seas like this one, climates became cooler and drier. Such climatic change resulted in new ecosystems that could not provide enough biomass to support dinosaur life.

Answer 2

12. D
13. C
14. A
15. B

Answer 3

@Gdeinward

Answer 4

12 is A, you need to read carefully

Answer 5

13 ur correct

Answer 6

14 is b, You must not, evolution was never mentioned in the passage,

Answer 7

*note

Answer 8

is 15 C

Answer 9

do i keep on with questions here or new post

Answer 10

You are correct about 15, good job and sorry