Which of the following is not an example of mechanical control of nonnative species? a. pulling b. inspections c. net barriers d. mowing

Answer;

-Net barriers

Explanation;

-Methods used to control nonnative species include mechanical, biological, and chemical means.

-Mechanical methods include mowing, clipping, hand pulling, and any other method that removes all or some of the plant. Mowing can be effective at removing plant seed heads before maturity, and forces plants to use energy resources to continue growing, instead of moving on to reproduction. If hand pulling is done at the right time, it removes the whole plant before it matures.

-The key to mechanical control is to get the plant before the seed matures, this way any disturbance to the seed head does not further spread the seed.

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)