Patterns. Because you’d preform more than one experiment, when looking at the data, there should be a pattern, if done correctly. Sometimes rounding is needed
plants cannot sustain themselves because they need dirt for fertilizer the sunlight to grow in water for hydration. they also need homeostasis for a heathy balance
There are many different factors, but some are: the amount of natural resources (food, water, etc.), amount of predator/prey, and availability of shelter.