Use the photo below to answer these questions 1) what is a trophic level?
2)what do energy pyramids represent?

3)Explain how energy limits the number of trophic levels in a food chain or web?

4)what is an autotroph?

5) what is a heterotroph?

6) how much energy does each trophic level of your food chain have from the questions above , if your producer starts with 100 units of energy?

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.