Keystone species ; this is a species whose presence is critical to the composition and integrity of the community
Answer:
The answer is: passing laws to prevent a certain type of scientific research.
Respiration= oxygen is converted to CO2
Photosythiesis=sunlight is converted to food for the plant through the chloroplasts and then the plant lets out Oxyegen and takes in CO2
the meaning is that the cell is filled by choroplast.