The species Homo sapiens is thought to be how many years old?

A) 25,000
B) 60,000
C) 95,000
D) 120,000
E) 195,000

The amphibian heart has

A) two separate atria and two separate ventricles that partition oxygen-rich and oxygen-poor blood.
B) two separate atria and one shared ventricle that allow oxygen-rich and oxygen-poor blood to mix.
C) two separate ventricles and one shared atrium that allow oxygen-rich and oxygen-poor blood to mix.
D) one atrium and one ventricle similar to the fish.
E) one atrium and one ventricle but reroutes the blood through the heart after passing through the gills.