Question

question 6
which trait came along the earliest in the evolution of animals and is one of the traits we use for classification?
a colonial structure
b multicellularity
c presence of tissues
d possession of a body cavity
question 7
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Explanation:

• Multicellularity is a fundamental trait. Early animal evolution saw the transition from single - celled to multicellular forms.
• Colonial structure (A) is a more complex form that builds on multicellularity.
• Presence of tissues (C) requires a higher level of cellular organization which comes after multicellularity.
• Possession of a body cavity (D) is an even more advanced trait in animal evolution.

Answer:

B. multicellularity