A. THERE HAS BEEN ONLY ONE MASSB. EXTINCTION OF SPECIES HAS OCCURRE...

76. - DETHIHSG COM–DAP AN VA DE THI HOC SINH GIOI MON ANH VAN LOP 10 SO GD
DETHIHSG COM–DAP AN VA DE THI HOC SINH GIOI MON ANH VAN LOP 10 SO GD

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A. There has been only one mass

B. Extinction of species has occurred from time to t

C. Extinctions on Earth have generally been massive.

D. Dinosaurs became extinct much earlier than scientists originally believed.