How does no light affect the plants?

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static

In an experiment, how can i change human errors? be specific.