I need Biology help please...?!?

I

imported_Amber

New member
1.Which of these animal groups was NOT present by the end of the Cambrian?
A. bryozoans
B. arthropods
C. chordates
D. mollusks

2.Flying insects evolved by at least the:
A. Carboniferous
B. Ordovician
C. Permian
D. Silurian
 
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