Question 1

When colonies of bacteria fossilize, they can form ---

Accepted Answer

Stromatolites.

Answer

half -life.

Answer

Epochs

Answer

Eras

Question 2

On the geological time scale, periods are divided into .

Accepted Answer

Epochs

Answer

Eras

Answer

sub period

Answer

Energy ,

Question 3

The movement of the Earth's  continents over time is caused by ---

Accepted Answer

Plate tectonics.

Answer

Heavy wind

Answer

Lightning

Question 4

The time it takes for half the isotopes in a sample to decay is called its ---

Accepted Answer

Half --life.

Answer

Eras

Answer

Period

Answer

Decade

Question 5

The longest time spans in the geological time scales are called ---

Accepted Answer

Eras

Answer

Years

Answer

Months

Answer

period

Question 6

How did scientists establish the appropriate age of fossils?

Accepted Answer

By Radioactive dating.

Answer

By looking at the fossils

Answer

By taking picture of the fossils

Answer

by looking at the  position of the layers of the Mountain.

Question 7

How do heterotrophs affect the atmosphere ?

Accepted Answer

Releasing Carbon dioxide into the atmosphere.

Answer

Releasing oxygen in the atmosphere.

Answer

Releasing Argon in the atmosphere .

Answer

Releasing Methane in the atmosphere .

Question 8

What gases present in the atmosphere of Earth today were not present in Earth's ancient atmosphere ?

Accepted Answer

Oxygen and Argon

Answer

Ammonia and Methane

Answer

Carbon  dioxide/Hydrogen

Answer

Nitrogen and sulfur dioxide

Question 9

in the atmosphere today ,which gases are most abundant?

Accepted Answer

Nitrogen ,Oxygen, and Argon

Answer

Oxygen, Argon, .and methane.

Answer

Hydrogen ,Helium, Oxygen

Answer

Carbon dioxide, Oxygen, and Sulfur dioxide

Question 10

About how long ago did Earth Form?

Accepted Answer

4.5 billion years ago.

Answer

3.5 billions years ago.

Answer

6.5 billion years ago.

Answer

8.5 billions years ago.

Question 11

If the carbon- 14in the mollusk has undergone two half -lives ,how old is  the mollusk?

Accepted Answer

11,200 years

Answer

88.000  years

Answer

56,000 years

Answer

45,000  years

Question 12

If the mollusk contained 1, 000 grams of carbon-14at the time of its death, how much carbon 14 should still be present in the mollusk after 3 half -life .

Accepted Answer

Approximately 125 grams.

Answer

900 grams

Answer

500 grams,

Answer

800 grams.

Question 13

When is the mutation likely to be beneficial?

Accepted Answer

when it is useful to the environment.

Answer

when it has no affect on the environment.

Answer

It never be beneficial.

Question 14

What is the meaning of evolution?

Accepted Answer

Evolution means change over times .

Answer

abrupt change .

Answer

Not at all any change.

Answer

Genetic abnormality

Question 15

When is the meaning of convergent evolution?

Accepted Answer

When different species with different ancestors develop similar characteristics.

Answer

when there is a same species shows different characteristics.

Answer

species that interact closely often adapt to one another in a process.

Question 16

What is species?

Accepted Answer

A species  consists of interbreeding populations of organism that can produce healthy , fertile offspring.

Answer

A species consists of group of organism that are in the body system.

Answer

A species consists of group of animal populations.

Question 17

Name the two scientific theories that explain the origin of earth's organic molecule.

Accepted Answer

Outer space theory and chemical theory.

Answer

Theory of evolution and divergent theory .

Answer

Mechanical theory and chemical theory.

Question 18

What is  an atmosphere?

Accepted Answer

The Gases around the Earth .

Answer

They are the five steps of scientific method

Answer

They are the mats of eukaryotic cells

Question 19

What are autotrophs?

Accepted Answer

Living things that know how to make their own food

Answer

They are primates

Answer

They are lake flowers

Answer

They are organism which does not know how to make food

Question 20

How was the solar system formed?

Accepted Answer

The solar system was formed from swirling gases and dust

Answer

The solar system formed when the atmosphere cooled down

Answer

Because the heat and pressure of the atmosphere

Answer

The solar system formed when the water vapor goes up

Question 21

Based on the Carbon dioxide in the air , how would you expect temperature on ancient Earth to differ from Earth.s temperature today ?

Accepted Answer

Ancient Earth"s temperature would be higher.

Question 22

Most Scientist believe that the formation of life had to follow four steps . what are those steps?

Accepted Answer

Inorganic matter ,simple organic molecule ,polymers Protocells,cells.

Question 23

Explain the two theories of the origin of organic molecule?

Accepted Answer

The chemical theories and the outer space theories.

Question 24

Compare and contrast the the environment of early Earth with that of Modern Earth.

Accepted Answer

Early Earth's atmosphere had very less O2 and N2 and high percentage of carbon dioxide and some methene, and Sulfur dioxide. Modern Earth has more Nitrogen and Oxygen and little Argon but less far less carbon dioxide.

Question 25

Explain one of the Hypotheses about the formation of Eukaryotic cells.

Accepted Answer

Infolding and Ingulf theory.

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