Vocabulary Evolution is change over time. The naturalist Charles Darwin was the first person to write a thorough collection of evidence supporting evolution. Species a group of organisms that share traits AND can reproduce a fertile offspring. 5.1 Natural Selection

Darwin’s Claims Darwin made observations about the diversity and uniqueness of organisms. He then made CLAIMS about the process responsible for this diversity. Darwin used all his years of observations as EVIDENCE to support these claims. 5.1 Natural Selection

Left - Voyage of the Beagle Look at Figure 2 on pg 211. Where did the HMS Beagle stop before reaching the Galapagos Islands? Multiple locations on South America

Voyage of the Beagle 5.1 Natural Selection

Tortoises Darwin found giant tortoises on all the Galapagos Islands, but nowhere else. He wondered why they were so different even though they lived on islands only about 50 miles apart. He reasoned that each new population changed slightly, or evolved, to fit its unique environment on the island. 5.1 Natural Selection

LEFT- Tortoises Read the first two paragraphs on pg 212. What is unique about these tortoises? 5.1 Natural Selection Dome-shapedSaddle-shaped

LEFT- Tortoises Read the first two paragraphs on pg 212. What is unique about these tortoises? 5.1 Natural Selection Dome-shapedSaddle-shaped Short necksLong necks Eat low growing plantsHigh growing catus.

LEFT- Tortoises Why might one tortoise population evolve long necks? Share with your partner. 5.1 Natural Selection

RIGHT - Species –Western spotted skunk, –mountain lions –great white sharks –With your partner think of five other species, and write them down.

Selective breeding is breeding plants and animals to get offspring with desired characteristics based on HUMAN needs only. 5.1 Natural Selection Vocabulary

Not a Species –A mule is the offspring of a male donkey and a female horse. Horses and donkeys are different species, with different numbers of chromosomes. –A liger is the offspring of a male lion and a female tiger. LigerLiger in action These are both examples of selective breeding, even if accidental.

LEFT - Not a Species Summarize what you learned about ligers! Now summarize what you learned today.