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.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: