A. Crossword on Earth's Record of Life Directions: Use the clues to answer the crossword puzzle. The words in the puzzle are terms you will encounter in the lesson on the history of life on Earth. ACROSS 3 _fossil, a kind of fossil that is the marking left by an animal, for example, a footprint 5 dating, technique used to determine the age of fossils by comparing them with other fossils in different layers of rock 8 Rocks made of compressed particles 9 Elements that give off high-energy particles 1 12 dating, a technique used to approximate how rocks formed years ago; used to infer how old those rocks are 2 CHAS 13 Physical evidence of a living thing that lived long ago that EDUCA 3 scientists use to study the past MENT OF 5 6 8 DOWN NCA 1 The era when the earliest life forms appeared 2 Longest segments of the geologic time 4 A type of fossil, organic material is converted into stone 10 |11 6 Subdivisions of a geologic period 12 7 A scientist who studies the history of life on Earth through the fossil record 13 10 What happened to the dinosaurs that marked the end of the cretaceous period, about 66 million years ago 11 Subdivision of a geologic era 0: A L

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Human Evolution

Human evolution is the process of evolution of humans from early man to anatomically modern humans. The process of evolution in humans leads to the gradual development of traits like bipedalism. Humans are the highly social animals that make them the most advanced animal on Earth.  Human evolution is an outcome of interaction among the following processes: