How can water ph level be increased in a hydroponics system?

A. By adding water
B. By adding limestone
C. By adding vinegar
D. By adding baking soda

The climate in the temperate zone is cold in summers and warm in winters very cold year-round very warm year-round warm in summers and cold in winters

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

Which physical law states that all orbits are conic sections?