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