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