A Reflectional Symmetry is a type of symmetry in which one half of the object is the mirror image of the other. 1  A figure may have both horizontal and vertical lines of reflection. 2  The alphabet V has reflectional symmetry about a vertical line of reflection.  The hexagon has reflectional symmetry about both horizontal and vertical lines of reflection.
RENAL REGULATION OF BICARBONATE. The kidneys regulate the [HC03-] by. 1) conserving or excreting the HC0 3 - present in the glomerular ultrafiltrate; 2) producing new HCO3- which enters the body fluids as the kidneys excrete ammonium salts and titratable acids (this sum is called net acid) in the urine.
The place where two plates move apart, or diverge, is called a divergent boundary (dy vur junt). Most divergent boundaries occur along the mid-ocean ridges where sea-floor spreading occurs. Divergent Boundaries. Divergent boundaries also occur on land. When a divergent boundary develops on land, two of Earthâs plates slide apart. A deep valley called a rift valley forms along the divergent boundary. For example, the Great Rift Valley in East Africa marks a deep crack in the African continent.