Which of the following is a true statement about bacteria?

only exist in a few environments

grow to extremely large size

are harmful

can be both helpful and harmful

Can both be helpful and harmful.

Explanation:

Bacteria are unicellular , microscopic organisms that live everywhere. They are both harmful and helpful. Some bacteria invade living cells and cause diseases of different kind, bacteria also cause food contamination thereby making it unfit and harmful when consumed.

Bacteria are also helpful in that they help in digestion , some are present In intestine of animals that aid digestion, bacteria are useful in food manufacturing companies for fermentation of wine, yoghurt e.t.c, they also help in biodegration and decomposition of organic matter thereby releasing nutrients to the soil.

Bacteria are both helpful and harmful.

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive