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which option is a period?

mesozoic

triassic

precambrian

ceonzoic

You see a white marker with an orange circle and black lettering. what does this marker tell you

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Describe the two types of vascular tissue