Therefore, in Doppler Effect only the frequency and wavelength are changes and the wave speed does not change
That would be A.
Cells have specific receptors for different hormones that allow the intake of them.
No, the most healthiest and recommend way to deal with stress is by exercising. (For exp: walking, jogging, interaction, etc...)
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
