As food molecules are broken down during carbon is released back into the atmosphere as carbon dioxide. a. breathing b. the nitrogen cycle c. the water cycle d. cellular respiration

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

Which animal is a producer in this ecosystem

In an hydrogen ion pump the energy is used to join small molecules together to make larger ones which factor most likely has the greatest effect on the number of molecules mitochondria can produce