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Stated that acquired characteristics can be passed on to offspring.
Darwin Pieces Together the Puzzle
Darwin’s View of Evolution Darwin Pieces Together the Puzzle Those giraffes with longer necks got more food and were better able to survive to reproduce, passing on the long-neck genes to their offspring. Over time, giraffes evolved longer necks.
“ Of course, long before you mature, most of you will be eaten.” 4 Key Ideas of Natural Selection
Radioactive Dating: Process by which traces of radioactive elements are analyzed to calculate the actual age of a fossil
Many radioactive elements can be used as geologic clocks. Each radioactive element decays at its own nearly constant rate. Once this rate is known, geologists can estimate the length of time over which decay has been occurring by measuring the amount of radioactive parent element and the amount of stable daughter elements
Carbon-14 Dating - Determines the age of fossils of a biological origin up to approx. 50,000 years old. - used in dating things such as bone, cloth, wood, plant fibers, etc. 5,700 year is C 14 half-life
Half-life of carbon-14 is 5730 years 22,920 11,460 28,650 17,190
Radiometric Dating Evidence to Support Evolution Radioactive Parent Stable Daughter Half life Potassium 40 Argon 40 1.25 billion yrs Rubidium 87 Strontium 87 48.8 billion yrs Thorium 232 Lead 208 14 billion years Uranium 235 Lead 207 704 million years Uranium 238 Lead 206 4.47 billion years Carbon 14 Nitrogen 14 5730 years