Which wavelength will maximise the rate of photosynthesis

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?