Which of the following is considered to be the only natural permanently magnetized material?
alnico
lodestone
magnetite
iron

The correct answer is "lodestone".

Explanation:

Lodestone is a naturally occurring magnet comprised of a magnetized form of magnetite. Its name come from the term "leading stone" because it was first used for navigation purposes to create magnetized iron that was used as a magnetic compass. Lodestone is permanently magnetized and is the strongest magnet found in nature.

"do a testcross with a homozygous recessive plant."

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.