Pls help me with this

An easy way to calculate the amount of energy available at each level is to what?

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?