[Answer] 4. This metal is the fifth most abundant element in the earth's crust, and is an essential...

Step 1 : Introduction to the question "4. This metal is the fifth most abundant element in the earth's crust, and is an essential constituent of leaves, shells, bone, and teeth."

...1. iodine 2. calcium 3. phosphorous 4. zinc Calcium is perhaps best known for its numerous compounds. Common chalk is a compound containing calcium.

Step 2 : Answer to the question "4. This metal is the fifth most abundant element in the earth's crust, and is an essential constituent of leaves, shells, bone, and teeth."

calcium:

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