Topic 5 Natural Selection and Evolution-8th grade

Evolution typically happens...

• in a few weeks
• over millions of years
• never
• in 100 years

Bird's beaks evolve mainly due to the type of ___________________ available.

• food
• water
• shrubs
• mates

Darwin said that the number of offspring an organism has ___________________

• stays the same
• is more than can survive
• is less than needed

Darwin said that within a species there will be _________________________

• nothing different
• variation/differences

Organisms with differences/variations that are helpful will ______________________

• live longer
• become extinct
• show no change

These cause variations.

• mutations
• adaptations
• a desire to change
• injuries

A slight difference in an inherited trait between individual members of the same species.

• variations
• adapatations
• homologous structures
• analogous structures

An inherited trait that increases an organism's chance of surviving and reproducing.

• variation
• adaptation
• vestigial structure
• mutation

The discovery of DNA and genes proved that

• Darwin was wrong
• mutations create variations and come from genes
• we are all the same species
• bats and butterflies have a very close common ancestor

What is it called when humans decide which traits of an organism are the most desirable and only allow those organisms with the specific, desired traits to breed.

• biological evolution
• evolution by natural selection
• artificial selection
• inbreeding