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What does it mean if two different animals possess homologous structures?
Homologous structures are similar evolutionary structures that evolved in different organisms that were used for the same purpose long ago but are no longer in use
Why do consumers break down the structures of the organisms they eat?
so the organisms can be chemically digested for use and energy in the body.
What structures could a cellular organism use to move through its environment?
Some organisms use cilia
How do scientists use scientists use structural similarities to determine the evolutionary relationship?
They see similarities with structures between modern day organisms and older organisms.
What is the term for structure that has no use in an organism?
Vestigial StructureA vestigial structure is a structure that appears to no longer have a use in the body.
Structures that taxonomists use to group organisms such as having the same bones of the forearm in humans and the front leg of a dog?
Those are referred to as homologous structures.
Are homologous structures similar structures in related organisms?
yes
Which evolved first - organisms with complex body structures or those with simple body structures?
Complex organisms evolved from simple organisms, so simple organisms evolved first.
Homologous structures in organisms suggest that the organisms?
common ancestor
Would vestigial structures make any sense if organisms did not evolve?
No, because the use now would be the use then which is not really vestigial.
What kind of information do scientist use to classify organisms?
Taxonomists use fossil records, morphological structures, and DNA/genetic information in order to classify organisms into different kingdoms, phylums, and classes.
What should you look for when considering whether structures from two kind of organisms are homologous?
The structures should have similar anatomy in the two organisms.
