Why were most test tubes incubated at 37 ⁰C?

Optimal Growth Conditions

Explanation:

Different bacteria like to grow at different temperatures.  By changing the temperature. Organisms that grow best at human body temperature, which is approximately 37 degrees Celsius (98.6 degrees Fahrenheit), are called mesophiles.

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the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

meiosis is the correct answer