Which is the first type of cell to differentiate?
a. neuron
b. epithelial cell
c. muscle cell
d. blood cell

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Which short-term environmental change is most likely to lead to ground shifting, landslides, and the collapse of buildings or roads? forest fires flooding earthquakes