For any activity such as running, jumping, or hunting, animals have to use energy obtained from food. What organelle performs a similar function within a cell to fuel cellular activities? A. Nucleus

B. Mitochondria

C. Vacuole

D. Cell Membrane

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