When the muscle cell was without oxygen, piruvate was brought to produce
1.ethyl-alcohol & atp
2.methyl-alcohol & atp
3.lactic & atp
4.lactic & nad+
i think the correct answer is 3 but the book answer 4.
i don't understand

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

Pulmonary arteries carry highly oxygenated blood. true or false?

Homo heidelbergensis was a tall, muscular hunter, who used both tools and weapons. because h. heidelbergensis was not a gatherer/forager, but ate a varied diet including meat and fish, we would expect to see what anatomical changes?