periodic motion : motion repeated in equal intervals of time. periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the earth in its orbit around the sun, and a water wave.
the environmental manipulation of a crop may have unexpected consequences in many ways.
all of the above can happen. it may need more water than the original crop, and it may give off more or less fruit.
it may cause harm to the environment as well in ways we do not know about.
such kind of manipulation needs to be done with great care.