When iron reacts with oxygen, it forms iron oxide, or rust. 4 fe + 3 o2 2 fe2o3 if 112 g of iron (fe) combines with 24 g of oxygen (o2), how much iron oxide is formed? (88 g fe2o3) (112 g fe2o3) (24 g fe2o3) (136 g fe2o3)

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

The transport tubes from food came down the plant are called?

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.