Jaoquin buys 3 dozen lightbulbs. after changing the lightbulbs in his house, he has 15 lightbulbs left. how many lightbulbs did he use? explain your work. i need the like right

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

This is the interaction of two organisms where one is and the other is neither nor harmed.

Which spheres are involved when sedimentary rocks formed from parts of seashells at the bottom of the ocean? a.) biosphere, atmosphere, geosphereb.) geosphere, hydrosphere, biosphere c.) geosphere, exosphere, hydrosphered.) hydrosphere, biosphere, atmosphere