HSCA 9 Review Do Now

Scientists around the world use a standardized taxonomic system. Why would scientists want to use a taxonomic system that is standardized?

• In order to avoid confusion with the identification of organisms
• Because Linnaeus established the system
• So that Latin names can be applied for all practical purposes
• In order to place organisms in different groups

Arthropods are joint-legged animals. Spiders, crabs, pill bugs, centipedes, and millipedes are examples of the many types of arthropods. Which of these arthropods are most closely related?

• Arthropods of the same family
• Arthropods of the same class
• Arthropods of the same genus
• Arthropods of the same kingdom

After examining the fossil record, scientists have determined that scorpions today are much smaller than their extinct ancestors. For example, Jaekelopterus rhenaniae, a giant scorpion species that lived 255 million to 460 million years ago, was 2.5 meters long. 
Which of the following conclusions is supported by this information?

• Scorpions today have increased their numbers since they first appeared.
• Scorpions in the fossil record are smaller than their descendants are.
• Scorpions have changed as a result of natural selection.
• Scorpions do not appear in their original state in the fossil record.