6. Significant mass extinctions occurred during which of the following epochs? O A. Triassic, Permian, and Cretaceous
B. Triassic, Permian, Cretaceous, Pleistocene, Ordovician, and Devonian
O C. Pleistocene, Ordovician, and Triassic
D. Ordovician, Triassic, Jurassic, Silurian, Eocene, and Oligocene

Which properties describe all matter?

What are the characteristics of living things

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.