Questions: Which statement about bacteria is true?
Bacteria are always helpful.
Bacteria require delicate living conditions.
Bacteria have existed for more than 3 billion years.
Bacteria are multicellular organisms.
Transcript text: Which statement about bacteria is true?
Bacteria are always helpful.
Bacteria require delicate living conditions.
Bacteria have existed for more than 3 billion years.
Bacteria are multicellular organisms.
Solution
The answer is the third one: Bacteria have existed for more than 3 billion years.
Explanation for each option:
Bacteria are always helpful.
This statement is incorrect. While many bacteria are beneficial and play crucial roles in processes such as digestion, nitrogen fixation, and decomposition, some bacteria can cause diseases and infections.
Bacteria require delicate living conditions.
This statement is incorrect. Bacteria are incredibly versatile and can survive in a wide range of environments, including extreme conditions such as hot springs, deep-sea vents, and acidic environments.
Bacteria have existed for more than 3 billion years.
This statement is correct. Fossil evidence suggests that bacteria have been present on Earth for over 3 billion years, making them one of the oldest forms of life.
Bacteria are multicellular organisms.
This statement is incorrect. Bacteria are unicellular organisms, meaning they consist of a single cell.
Summary:
The correct statement is that bacteria have existed for more than 3 billion years.