Classify each substance below as an atomic element, a molecular element, a molecular compound or an ionic compound.
co2-
ag-
kcl-
f2-
i2-
hbr-
cr-
al2o3-

Iwill give extra points to who gets this right

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.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?