Nitrogen cycle
Nitrogen cycle
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AMMONIA
AMMONIFICATION
ATMOSPHERE
DENITRIFICATION
LEGUMES
LIGHTNING
NITRATES
NITRIFICATION
NITRITES
PROTOPLASM
| P | H | V | G | M | R | D | N | S | P | Q | P | Z | I | N |
| P | L | Z | A | L | M | R | O | D | M | X | E | S | O | I |
| Y | I | I | K | M | S | R | I | G | R | Y | Z | I | G | T |
| Z | G | A | T | O | A | E | T | M | X | N | T | S | X | R |
| M | H | D | K | M | L | S | A | F | N | A | R | E | Q | I |
| J | T | S | L | G | P | U | C | M | C | T | T | B | X | T |
| U | N | E | O | F | O | P | I | I | M | M | E | Z | W | E |
| O | I | T | U | P | T | F | F | S | I | O | O | U | H | S |
| P | N | A | R | L | O | I | I | E | S | S | N | V | M | O |
| X | G | R | Y | F | R | Y | N | M | W | P | I | I | L | D |
| G | J | T | U | T | P | G | O | U | K | H | B | Z | A | Z |
| N | Z | I | I | A | T | A | M | G | Q | E | U | P | L | A |
| K | P | N | S | Q | B | I | M | E | Y | R | D | S | S | N |
| Q | E | N | M | F | I | N | A | L | W | E | O | H | F | T |
| D | I | R | Y | V | C | T | G | V | T | A | O | K | O | S |
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