Speciation can occur when two populations of a species become separated from each (ther. What is the best explanation for why speciation occurs?
OA. One of the populations tends to begin breeding with a different species and produces sterile offspring.
OB. Populations of the same species continue to interbreed even after they have been separated.
OC. One of the populations loses the ability to produce viable offspring and becomes extinct.
OD
Populations of the same species living in different environments tend to change in different ways.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

the answer is

i would think a oil tanker that has leaked in a bay