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

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Witch theory suggests all living things are made up of cell or cells

Why do mountaineers become breathless as they reach high altitudes