Question

______ require high salt concentrations to grown.
○ halophiles
○ mehtanogens
○ thermophiles
○ barophiles

Explanation:

• Halophiles are organisms that thrive in high - salt environments.
• Methanogens (note: there was a typo as "mehtanogens" in the option, but the correct term methanogens) produce methane and do not require high salt.
• Thermophiles need high temperatures, not high salt.
• Barophiles require high pressure. So the organism that requires high salt concentrations to grow is halophiles.

Answer:

A. halophiles