Consider the following statements. 1.A large majority of bacteria are useful to mankind 2.A bacterium, if allowed to multiply uninhibited for 24 hours, will produce a bacterial mass of more than 5 million tons. 3.The insectivorous plants obtain their nourishment from insects because they are unable to photosynthe size. 4.We obtain some of our important antibiotics from bacteria. Which of the above statement/s is/are true?