Why Body Structures Differ

an OLDER POPULATION from which two or more newer species descended

• common ancestor population

• descendant species

• shared structure

• evolution

a more RECENT SPECIES that evolved from an ancestor population

• common ancestor population

• descendant species

• shared structure

• evolution

Which is NOT a SHARED STRUCTURE found in the common ancestor of all of these species?

• 1, 2, MANY bone structure

• 4 limbs

• Fur

• 2 Extra Holes Behind the Eye In the Skull

Which descendant species had structures that gave remarkable running ability?

• dire wolf

• Titanotylopus

• fruit bat

• none of these

Which descendant species had structures that gave the ability to fly?

• dire wolf

• Titanotylopus

• fruit bat

• none of these

Which descendant species had structures that gave the ability to travel incredible distances?

• dire wolf

• Titanotylopus

• fruit bat

• none of these

Which structure would NOT help an organism survive in this environment?

• Slender, delicate bones that reduce weight

• Long, widely-spaced finger bones to support a wing

• 5th finger bone that forms a claw

• Elongated leg bones to travel long distances

Which structure would NOT help a predator survive in this environment?

• Long, widely spaced finger bones to support a wing

• Crest and arch in skull to attach powerful jaw muscles

• Spurs on leg bones to attach to large, powerful muscles

• Elongated leg bones to run long distances

Which structure would NOT help an organism survive in this environment?

• Long, widely spaced finger bones to support a wing

• Hump to store water and fat

• Fused leg bones to support more weight

• Elongated leg bones to travel long distances

Which is NOT a factor needed for a common ancestor population to evolve into different descendant species?

• Lots and lots of TIME

• A CHANGE in the ENVIRONMENT

• MUTATIONS that result in new adaptive traits

• ORGANISMS that CHANGE THEMSELVES to survive