What causes weather fronts to move?

A warm air mass pushes into a colder air mass (the warm front), and then another cold air mass pushes into the warm air mass (the cold front). Because cold fronts move faster, the cold front is likely to overtake the warm front. ... The warm air rises as these air masses come together.

Explanation:

Hope this helps!!

when warm air rises cold air covers the spot it was in so its a cycle warm air rises cold air fills its place

the answer to your question is sperm

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.