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WorksheetsLesson 46: Evidence of Common Ancestry
Total questions: 10
Worksheet time: 6mins
In its earliest stage of development, an organism is called a(n) _______________.
embryo
vestige
vertebrate
digit
Homologous structures are derived from a body part of a (a) ancestor.
______________ means serving little or no useful purpose.
Homologous
Vestigial
Pharyngeal
Analogous
This image shows the early embryonic development of three organisms. The striking similarities of the three organisms shown indicate -
the three organisms all contain a mutated sequence of DNA.
the three organisms are all the same species.
the three organisms are closely related.
the three organisms most likely share a common ancestor.
A _______________ is an animal with a backbone.
digit
forelimb
vertebrate
embryo
Though the leaves of flowers and cacti appear very different, their leaves are homologous because -
the basic function is different as well.
they have a similar basic structure.
the leaves fall from both plants.
they serve no useful purpose.
What is comparative anatomy?
The science dealing with the structure of animals and plants
The science of life or living matter in all its forms and phenomena
The study of the functions and activities of living organisms and their parts, including all physical and chemical processes
The study of evolutionary relationships between homologous structures
Embryonic development in some organisms looks very similar. Many scientists believe these similarities indicate -
that the organism may share a common ancestor.
that the organisms share homologous chromosomes.
that the organisms have analogous structures.
that no evolution has occurred.
Common (a) describes how distinct modern life forms share the same ancestor from which they evolved.
_________________ structures are structures that do not show common ancestry even though they might be superficially similar.
Homologous
Mutated
Vestigial
Analogous
