Occurs when particles in a gas lose enough energy to form a liquid

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

What type of weather does tropical continental air bring in summer? hot and cloudy cool and sunny hot and sunny cool and cloudy

The theories on the expansion of galaxies maybe re-examined to strengthen science should not be tested to strengthen science will weaken scientific knowledge if they change will become laws if they don't change