When you stub your toe, the pain message is carried to your brain by the: ?

9. the history of life on earth is recorded in

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

The term facultative anaerobe refers to an organism that