2)
before organisms with nuclei evolved, life on earth consisted only of unicellular
a) eukaryotes.
b) fungi.
c) prokaryotes.
d) protists.

Explain how ancient whale fossils found in eqypt are believed to support the theory of evolution.

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?