Several students want to conduct a descriptive investigation on igneous rocks. Which process is most likely to be part of their investigation?
A. observing igneous rock samples collected from different sites
B. conducting an experiment to study the composition of igneous rocks C. comparing observations of igneous rocks to observations of metamorphic rocks D. testing a hypothesis about igneous rocks using an independent variable

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.