What causes the aurora borealis or northern lights to occur

Why are fossils of organism's from the phanerozoic eon much more likely to be found than fossils of organisms from any other eon? a. more organisms present during the phanerozoic eon had soft body parts. b. organisms present during the phanerozoic eon were all microscopic. c. more organisms present during the phanerozoic eon had hard body parts. d. organisms present during the phanerozoic eon are the most ancient life forms.

Quiero una redaccion de yo soy medico y que tenga 10 lineas

Heyi am new to are you all americans? ( just want to know , i don't mean any offence ) ?