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Crossword clues

Solve these clues to fill the grid.

Gas in the air that we need to breathe
2 Across
Synthesis of carbohydrate from carbon dioxide and water
8 Across
A chemical substance that is present at the start of a chemical ___
10 Across
A process in which one or more substances are changed into others
12 Across
A surface on which an organism grows or is attached
13 Across
Living thing that grows in soil and makes its own food
15 Across
Clear liquid we drink that falls as rain
16 Across
Depending on free oxygen or air
1 Down
How plants make food from sunlight
3 Down
An essential structural component of living cells and source of energy for animals
4 Down
A monosaccharide sugar that has several forms
5 Down
Any of several complex proteins that are produced by cells and act as catalysts in specific
6 Down
Living or active in the absence of free oxygen
7 Down
Commodities offered for sale
9 Down
A substance that initiates or accelerates a chemical reaction without itself being affected
11 Down
A nucleotide derived from adenosine that occurs in muscle tissue
14 Down

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