Which is the which is the biotic factor? rotting carcass ,rock ,drop of water ,fire

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

The horizontal blue line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?