John realized that his orchard has been invaded by certain harmful invasive plants.  these plants are consuming all the soil nutrients and water, and they are outcompeting native plants.  john decided to cover the invasive plants with black plastic for one growing season.  which method did john use to control the invasive species?

Apositive rod is placed to the left of sphere a, and the spheres are separated. which best describes the spheres? sphere a is negative and sphere b is positive because protons from sphere a are attracted to the rod and move to sphere b. sphere a is negative and sphere b is positive because electrons from sphere b are attracted to the rod and move to sphere a. sphere a is positive and sphere b is negative because electrons from the rod move to sphere b and protons then move to sphere a. sphere a is positive and sphere b is negative because protons move from sphere b to the rod and also to sphere a.

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f