A diet rich in vegetables and fruits can lower blood pressure such as eating healthy
The mother liquor<span> is the part of a solution that is left over after it crystallizes. An example of a place you could find this is in sugar refinement.</span>
Purple stem plants can be formed by genetics, they use their energy slightly different from other plants, they use less energy, but that may also be because of bad nutrition, and because they may be hungry for nutrients.
The answer would be D because from my research it's the only one that didn't have a catalyst