9. What does energy efficiency mean? A. How much useful work we can get from each unit of energy used
B. How fast the energy can be expended
C. The maximum amount of energy an appliance can use
D. The overall energy use that is tracked throughout time

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?

Plz quick a natural resource that is replaceable through a cycle in nature or sustainable practice is called a? the subject is science