When magnesium combines with sulfur to form magnesium sulfide, it is oxidized to mg2+. which statement is true about this reaction?

a.
it involves gain of electrons.
b.
it involves loss of electrons.
c.
it involves loss of oxygen.
d.
it involves gain of hydrogen.

In the human body fibrinogen is necessary for sealing cuts and stopping the loss of blood. since fibrinogen is made of chains of amino acids it is an example of which type of organic molecule

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent

Which would be the most useful source of evidence to support mcneill's contention?