Green plants excrete gas through their leaves. I need answers

Aflashlight produces light using energy from the batteries. in which order does the energy change form? a. from chemical to electric to light energy b. from electric to light to chemical energy c. from electric to chemical to light energy d. from light to electric to chemical energy

What substance acts to prevent sudden ph changes in bodily fluids?

What type of plant is good for a bioassay and where can i buy it? i only have a month.