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

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

hope this !

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

the correct answer is b

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)