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A. Use the words in the box to complete the paragraph.$\newline$\begin{tabular}{l} $\newline$castings \\$\newline$aerate \\$\newline$exposure \\$\newline$ecosystem$\newline$\end{tabular}$\newline$Soil and all the living things in it make up an $\qquad$$\newline$Earthworms act as $\qquad$ , eating decaying matter in the soil and expelling it in the form of nutrient-rich $\qquad$ The worms also $\qquad$ the soil, which helps circulate oxygen. In return, the cool, moist soil protects earthworms from $\qquad$ and keeps them Hydrated $\qquad$