Kangaroos are mammals that lack a placenta. therefore, they must have an alternate way of supplying the developing embryo with

a. carbon dioxide
b. enzymes
c. nutrients

If animal agriculture was eliminated, how much grain would become available for human consumption?

Me the formula cacl2 represents the compound

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?