Which temperature is inferred to exist in earths plastic mantle

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

During a fierce storm a large number of tall trees on an island are uprooted by the wind and die. most of the trees on the island are now short trees and produce seeds that grow into short trees. what concept is shown in this example? question 5 options: natural selection artificial selection genetic engineering gene splicing