It’s 4 because a coiled springs is closely spaced then widen
Before 7 after 9. A pH smaller than 7 indicates acidity with 0 being completely acidic. A pH greater than 7 shows alkalinity with 14 being completely alkaline. 7 is neutral. Since NaOH is alkaline, adding it to a neutral substance would increase the pH and it would increase from 7 to 9.
It is D as it is the only answer referring to weather and climate.
Photosynthesis. Photosynthesis is the process the plant uses to absorbs light to make food
