Laboratory helps you identify things rather than the others using controlled variables
The answer is most simply A
Food webs with fewer species are more sensitive to the loss of species and ecosystem disturbances
Answer: this is because bacteria that encounter such an environment UNDERGO DEATH AS A RESULT OF WATER LOSS FROM THE CELL.
Option C.
Explanation: Water is a great medium of growth for bacteria. Several experiments have been carried out to support this statement. Also, it is a means by which the bacterium is transmitted from "a site" to another.