Unit Test #8 Quizizz

Which characteristic is necessary for natural selection to occur in a species? 

• stability of ecosystems

• variation of traits

• complex cellular organization

• very low mutation rate

What conclusion did Charles Darwin come to after observing the different beaks of finches on the Galapagos Islands?

• Finch populations had not evolved over time.

• The finch beaks had no relationship to the available food on the islands.

• Humans artificially selected finches based on their desired beak type.

• Finch populations evolved over time to favor beaks based on food type.

Natural selection happens when an individual's genes ______________ from the genes of other members of its species.

• Become different

• Stay the same

• Become separated

True or False? All changes in genes are harmless.

• True

• False

What is the definition of "variation?"

• The same traits in a population.

• The different ways that traits are expressed in a population.

• The same ways traits are expressed in a population.

• The place where an animal lives.

True or False? Variations are differences between individuals in a population.

• True

• False

True or False? Mutations are a source of variations.

• True

• False

Darwin wrote that organisms with traits that are best suited to the environment will ________________

• increase in number
  
• become extinct
  

If an organism can survive long enough to reproduce, it can pass on its good traits to its _____.

• offspring
• population
• natural selection
• species

With the peppered moths, when the forest was light, there were more ____ colored moths. 

• light
• dark