Development of multicellular organisms probably began with the formation of
A. bacteria.
B. colonies.
C. microspheres.
D. oxygen
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A.bacteria
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The first evidence of multicellularity is from cyanobacteria-like organisms that lived 3–3.5 billion years ago. To reproduce, true multicellular organisms must solve the problem of regenerating a whole organism from germ cells (i.e., sperm and egg cells), an issue that is studied in evolutionary developmental biology.
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