To qualify for sick leave, an employee must: 1  Work for the same employer, on or after January 1, 2015, for at least 30 days within a year in California, and.  Satisfy a 90-day employment period (similar to a probationary period) before taking any sick leave.
In replacement fossils the body dissolves and minerals are left in its place. In permineralization, the water enters the cells of the organism and deposits minerals in the spaces inside them. Petrified wood is a permineralized fossil. Whole Body Fossils. Whole body fossils occur when an entire organism, including soft tissues, is preserved. Examples include insects entombed in tree sap, which hardens to become amber, and mammoths encased in ice. Footprints and Trackways. Footprints made by prehistoric animals walking through the mud sometimes harden and become fossils.
Body fossils and trace fossils are the principal types of evidence about ancient life, and geochemical evidence has helped to decipher the evolution of life before there were organisms large enough to leave body fossils.