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