Lesson 7- Evolution Of Multicellular Life

Question 1

Precambrian Time

Few fossils exist from Precambrian time because the animals were all (blank).

Life existed only in the (blank).

Answer 1

soft-bodied, sea

Question 2

Rich fossil evidence shows that early in the (blank), there was a diversity of marine life.

Answer 2

Paleozoic Era

Question 3

The Paleozoic Era is divided into the following periods:

Answer 3

•Cambrian
•Ordovician
•Silurian
•Devonian
•Carboniferous

Question 4

Cambrian Period

The diversification of life at this time is called the “(blank) (blank).”

The first known representatives of most animal phyla evolved. These included:

Answer 4

Cambrian Explosion,
• invertebrates
• brachiopods
• trilobites

Question 5

(Blank) and (blank) (blank)

Reptiles evolved from certain amphibians.

Winged insects evolved into many forms.

Giant ferns and other plants formed vast swampy forests.

Remains of ancient plants formed thick deposits of sediment that changed into coal over millions of years.

Answer 5

Carboniferous and Permian Periods

Question 6

At the end of the (blank) (blank), there was a mass extinction in which many living things became extinct at the same time.

The mass extinction at the end of the (blank) affected both plants and animals on land and in the seas. As much as 95% of the complex life in the oceans disappeared

Answer 6

Permian Period, Paleozoic

Question 7

During the (blank) (blank), dinosaurs became dominant. The (blank) is also marked by the appearance of flowering plants.

The (blank) (blank) is often called the Age of Reptiles.

Answer 7

Mesozoic Era, Mesozoic , Mesozoic Era

Question 8

Jurassic Period

Dinosaurs became the dominant animals on land.

One of the first birds, (blank), appeared.

Many paleontologists think that (blank) are close relatives of dinosaurs.

Answer 8

Archaeopteryx, birds

Question 9

The (blank) (blank) ended with a mass extinction.

More than half of all plant and animal groups were wiped out, including all of the dinosaurs.

Answer 9

Cretaceous Period

Question 10

During the (blank), mammals evolved adaptations that allowed them to live in various environments-on land, in water, and even in the air.

Answer 10

Cenozoic

Question 11

The Cenozoic often is called the (blank)
The Cenozoic is divided into the two periods:

Answer 11

the Age of Mammals,
•Tertiary Period
•Quaternary Period