Groundwater supplies drinking water for 51% of the total U.S. population and 99% of the rural population. Groundwater helps grow our food 64% of groundwater is used for irrigation to grow crops. Groundwater is an important component in many industrial processes.
Answer:
D: the importance of carrying out procedures
It is called blind. a condition in which the participant is not aware if he/she is in the experimental or control group
