WorksheetsEvolution
Total questions: 20
Worksheet time: 15mins
This makes an organism more suited to its environment
The pelvic bone of whales is not needed for movement within the water. This is an example of a(n) ______________ structure.
vestigial
analogous
homologous
The forelimbs of mammals have similar anatomy because these groups descended from a recent common ancestor. Their bone structure is an example of a(n) ______________ structure.
vestigial
analogous
homologous
Many different groups of organisms have wings, even though they do not share a recent common ancestor. This is because they evolved in environments with similar selective pressures. Wings are an example of a(n) ______________ structure.
vestigial
analogous
homologous
Which trait did Darwin pay most attention to about the finches in the galapagos islands?
Their Feathers
Their Horns
Their Size
Their Beak Shape
Why are vestigial structures evidence for evolution?
They are useful in the organism and show natural selection at work.
They are not useful in the organism but they were probably useful in some ancestor of that species.
They show that these organs or behaviors help an organism adapt to new environments
because environmental conditions have to be just right (for formation & to prevent decay)
A mistake or change that occurs in the DNA sequence is called a ______________________.
Extinction
Speciation
Mutation
Genetic Variation
