Sasha could run one mile in 10 minutes last year. She can run a mile in 8 minutes this year. By what percent did her timing improve?
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Ответ:
Las pirámides de energía son necesariamente verticales en ecosistemas saludables, es decir, siempre debe haber más energía disponible en un nivel dado de la pirámide para soportar los requisitos de energía y biomasa del siguiente nivel trófico.
Explanation:
En cada nivel trófico los organismos convierten menos energía en biomasa que la que reciben. Por lo tanto, cuantos más pasos se produzcan entre el productor y el consumidor final, la energía que queda disponible es menor. ... Por tanto, el flujo de energía que atraviesa un ecosistema es unidireccional.