Phosphorus is important in bone tissue. which other element is important to bones?

Calcium.

Explanation:

Bone is a metabolically active, multifunctional tissue consisting of a heterogeneous population of cells at different stages of cell differentiation. The skeleton contains 99% of the body's Ca and functions as a reserve of this ion, whose concentration in the blood must be kept constant for normal body functioning. Bone is approximately 70% minerals, 20% organic matrix and about 10% water, which sets it apart from other less rigid connective tissues. The mineral or inorganic matrix is predominantly formed by Ca and P, in the form of hydroxyapatite crystals, Ca3 (PO4) 2, constituting approximately 60 to 70% of the bone weight and being responsible for the stiffness and compressive strength properties.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.