Spinal nerves are

-present only in the thoracic region where plexuses are absent.

-located exclusively in the vertebral canal.

-purely sensory nerves.

-present in thirty-one pairs.

Plz fast biotechnology is a growing field of applied biology. many crops such as corn have been engineered to be resistant to herbicides. therefore farmers can spray these chemicals to kill weeds growing near the crop without worries of killing the crop itself how does this type of biotechnology work? a. by changing the genetic make up of the crops. b. by causing the crops to kill the weeds. c. by changing the type of crops used. d. by changing the location of the crops.