The is a semipermeable membrane that forms a boundary between the cell and the external environment. 1 point
a.
golgi apparatus
b.
nucleus
c.
vacuole
d.
cell membrane
e.
mitochondrion

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