Consider two populations of birds: an original population on the mainland and a small population on a volcanic island. what data should you collect to determine if they are two different species according to the biological species concept?
a. the relative fitness of the mainland and island individuals.
b. the range of foods eaten by members of the two populations.
c. the degree of genetic difference between the two populations.
d. the physical appearance of the birds in the two populations.
e. the percentage of viable, fertile hybrid offspring formed if the two populations encounter each other.

E. The percentage of viable, fertile hybrid offspring formed if the two populations encounter each other.

Explanation:

The biological species concept is a concept which is  about a group of potentially interbreeding populations which become reproductively isolated from other groups of the same species.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds