Albinism is a genetic mutation that results in some animals being born without the enzyme that produces the pigment for skin and eye color. all but one statement is a possible explanation for this mutation. which is not an explanation? a) a dna base in the gene for the enzyme was removed. b) a dna base in the gene for the enzyme was substituted. c) the wrong mrna code caused the wrong protein to form. d) the organism gained an extra chromosome because of a non-disjunction.

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.