Explain the role of calcium ions in the structure of cell walls in plants.

Calcium ions are involved in many mechnisms: for example, stabilization of cell wall structures, acidic growth, ion exchange properties, control of the activities of wall enzymes. All these properties originate from the tight binding of calcium ions to the pectins present in the cell walls.

Explanation:

C. Running on track

Explanation:

kinetic energy depends upon velocity

(or speed of object )

hence , more the velocity ,

more kinetic energy it have.

so during running , we are in highest velocity