Mastering Biology Ch. 25

26 terms by maa2282

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Dr. Wiens

Reptiles first appeared during the _____ era.

Paleozoic

We are living during the _____era.

Cenozoic

Dinosaurs went extinct during the _____.

Mesozoic

_____ were the dominant vertebrate life form during the Paleozoic era.

Amphibians

Life arose during the _____.

Precambrian

Flowering plants first appeared during the _____.

Mesozoic

The Mesozoic era began approximately _____ million years ago.

251

The Precambrian time began at least _____ million years ago.

4,600

Seed plants first appeared during the _____

Paleozoic

The first prokaryotic cells appeared during the _____.

Precambrian

Animals first appeared during the _____.

Precambrian

The Cenozoic era began approximately _____ million years ago.

65

_____ were the dominant vertebrate life form during the Mesozoic era

Dinosaurs

Most modern animal phyla evolved during the _____ era.

Paleozoic

Bony fish first evolved during the _____ .

Paleozoic

How long ago do scientists believe life first began on Earth?

3.7 billion years

What process produces Earth's atmospheric oxygen?

photosynthesis

What evidence points to the date of the appearance of the first oxygen-producing organisms?

iron oxides in rock

The red sedimentary rocks of Western Australia resulted from the combination of oxygen and _____.

iron

Achaeans can tolerate which of the following extreme habitats?

near-boiling water
high pressure
very salty water
oxygen-free environments

Most scientists support the hypothesis that the Cretaceous mass extinction was caused by _____.

the impact of a large meteor

Why were the scientists in the video studying fossil leaves?

Plant anatomy is a good indicator of the climate.

What evidence do scientists use to support the meteorite impact hypothesis?

A global layer of iridium has been dated to about the same time as the mass extinction.

Why do scientists think that the iridium layer is evidence of meteorite impact?

Iridium is rare on earth and common in meteorites.

Scientists believe that a meteorite struck _____, leading to the extinction of dinosaurs

Yucatan, Mexico

How long ago did the dinosaurs go extinct?

65 million years

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