Question

Fill in the blanks
(Word bank words can be used either once, or not at all).

Plants and other photoautotrophs use CO2 (carbon dioxide) in the process of BLANK
to make BLANK and oxygen. Both plants and animals use oxygen in the biological process of BLANK and make CO2. The
BLANK is the main regulator of CO2 in the atmosphere, because it covers most of the Earth, and CO2 dissolves easily in it. Millions of years ago, huge deposits of carbon were stored, which were formed from dead plants and other BLANK organisms. Today these carbon rich deposits are burned as fossil fuels, which include BLANK, BLANK, and
BLANK. More CO2 is released in the atmosphere today than in the past because of the BLANK. But BLANK is a
greenhouse gas, as is water, and methane, and too much CO2 and other greenhouse gases produced by human activities in the atmosphere may be responsible for human accelerated BLANK.



Word Bank:
fermentation
decomposition
ozone
carbon monoxide
coal
respiration
oil
glucose
coal
burning of fossil fuels
carbon dioxide
methane
coal
photosynthesis
ocean
natural gas
decayed
natural gas
oil
soil erosion
oil
greenhouse effect
climate change
natural gas
oxygen

Answer 1

Plants and other photoautotrophs use CO2 (carbon dioxide) in the process of **photosynthesis** to make **glucose** and oxygen. Both plants and animals use oxygen in the biological process of **respiration** and make CO2. The **ocean** is the main regulator of CO2 in the atmosphere, because it covers most of the Earth, and CO2 dissolves easily in it. Millions of years ago, huge deposits of carbon were stored, which were formed from dead plants and other **decayed** organisms. Today these carbon-rich deposits are burned as fossil fuels, which include **coal**, **oil**, and **natural gas**. More CO2 is released in the atmosphere today than in the past because of the **burning of fossil fuels**. But **carbon dioxide** is a greenhouse gas, as is water, and methane, and too much CO2 and other greenhouse gases produced by human activities in the atmosphere may be responsible for human accelerated **climate change**.