B and E are the right answers. If this question is not multiple choice, I think E is the best answer.
All of these are not part of the life cycle. It's man-made. Think of it in biology terms - something that's created genetically.
You could’ve attached a question or a picture or something
Fast-moving cold fronts force the warm air ahead of them to rise more quickly than slow movers. The clouds and rain are mostly along the front or ahead of it, and heavy rain or thunderstorms are common. A slow-moving front lifts the warm air more gradually; the rain is less intense, and the clouds form along and *behind* the surface cold front.
Hello!
If the number of snakes increased, the number of rabbits decrease.
If the number of insect eating birds decreased, the amount of grass increases.
Hope this helped!