The Reason for the Hardness of Bone Is That the Spaces

question 39

Short Answer

The reason for the hardness of bone is that the spaces between bone cells are filled with ___________.

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Definitions:

Political Party

An organized group of people with similar political aims and opinions that seeks to influence public policy by getting its candidates elected to public office.

Interest Group

An organization or group that advocates for its members' interests, often in the political realm.

National

Pertaining to or encompassing an entire nation, as opposed to being regional or local; often refers to governmental policies or initiatives at the country-wide level.

State

An organized political community under one government; a nation or territory considered as an organized political community.