What trends/characteristics of humanity changed over time and which ones remained the same? Think of human ability to communicate, organize, create, destroy, etc. Has to be two paragraphs long

Every winter i fly home to chicago, it takes 3 hours. what is my average speed

Each autumn the forest floor is covered by leaves that have fallen from trees which type of organisms is most effective in decomposing the leaf tissue allowing the nutrients and minerals to be recycled in the environment?

Ahummingbird travels from plant to plant to feed itself. which of the following ecosystem services does this hummingbird most likely provide? i. pollination ii. seed dispersal iii. soil preservation i only ii only iii only i and ii only ii and iii only