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