Based on the above information and diagram, using the similarities of physical traits, which pair of organisms might be grouped for scientific study?

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Scientists often place living organisms into related groups for the purpose of studying their physical characteristics. The diagram below shows five single-celled organisms.

Based on the above information and diagram, using the similarities of physical traits, which pair of organisms might be grouped for scientific study?
A . A and D
B . B and C
C . B and E
D . C and D
E . C and E

Answer: E