What is the producing of a physical, conceptual, or mathematical representation of a real phenomenon that is difficult to observe directly?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Effect of rotenone and antimycin a on electron transfer rotenone, a toxic natural product from plants, strongly inhibits nadh dehydrogenase of insect and fish mitochondria. antimycin a, a toxic antibiotic, strongly inhibits the oxidation of ubiquinol. (a) explain why rotenone ingestion is lethal to some insect and fish species. (b) explain why antimycin a is a poison. (c) given that rotenone and antimycin a are equally effective in blocking their respective sites in the electron-transfer chain, which would be a more potent poison? explain.

Condensation happens when water vapor cools. true or false? ?