Natural Cycles

Question 1

About 95% of living bodies are made from

Answer 1

4 elements

Question 2

The 4 elements are

Answer 2

Hydrogen

Oxygen

Carbon

Nitrogen

Question 3

The 4 elements constantly cycle through the

Answer 3

Biosphere

Question 4

Carbon and nitrogen cycles are driven by

Answer 4

Biological action

Question 5

About _ percent of a living organism is made from

Answer 5

Carbon

Question 6

Carbon only makes up _ percent of natural non-living material

Answer 6

0.2

Question 7

Life takes carbon from environment primarily by _ and concentrates it in bodies

Answer 7

Photosynthesis

Question 8

Carbon is released from living bodies during

Answer 8

Respiration

Question 9

Carbon is released from living bodies when they

Answer 9

Die

Question 10

After released by bodies, carbon returns to natural

Answer 10

Carbon sinks

Question 11

Carbon sinks include (a,r)

Answer 11

Atmosphere

Rock

Question 12

Carbon sinks include deposits of (2)

Answer 12

Oil

Gas

Question 13

CO2 makes up only _ percent of atmosphere

Answer 13

0.04

Question 14

Dead matter buried in low oxygen environments does not

Answer 14

Fully composed

Question 15

Due to not fully composing, carbon

Answer 15

Stays in ground

Question 16

Over millions of years, once living material becomes (2)

Answer 16

Solid coal

Liquid petroleum

Question 17

Over millions of years, once living material becomes natural gas such as

Answer 17

Methane

Question 18

When organic matter, including fossil fuel, is burned, it releases (3)

Answer 18

Heat

Ash

CO2 gas

Question 19

_ released into atmosphere when we use fossil fuels

Answer 19

Carbon

Question 20

Almost all living things produce CO2 as a waste product of

Answer 20

Respiration

Question 21

Respiration is the biochemical process that releases energy from

Answer 21

Food

Question 22

Carbon in remains of dead organisms is released by

Answer 22

Bacteria

Question 23

Carbon also released by other _ that consumer dead organisms

Answer 23

Decomposers

Question 24

Plants use energy from sunlight to lock CO2 into

Answer 24

Bigger, more complex molecules

Question 25

Molecules like

Answer 25

Sugars

Question 26

_ lock co2 into sugars on ocean surface

Answer 26

Single-celled algae