Based on his studies, who among the following showed that sunlight is essential to the plant process that somehow purifies the air fouled by burning candles or breathing animals?

I. 6x² + 19x + 10 = 0

II. y² + 10y + 25 = 0

I. 9x² + 45x + 26 = 0

II. 7y² – 59y − 36 = 0

I. 99x² + 161 x + 26 = 0

II. 26 y² + 161 y + 99 = 0

I. 6x² - 13 x + 6 = 0

II. 15 y² + 11 y - 12 = 0

I. 2x² – 5x - 12 = 0

II. y² – 11y + 30 = 0

I. 18p²- 21p + 6 = 0      

II. 16q² - 24q +9 = 0

I. 4x² - 21x + 20 = 0

II. 8y² - 22y + 15 = 0

I. x² - (16)² = 0

II. 2y - 14 = 0

I. x² + 12√2 x + 22 = 0

II. y² - 13√2 y – 28 = 0

I. 2 x ² + x  – 1 = 0                 

II. 2 y ² - 3 y + 1 = 0