What is the relationship between molecules and atoms? A. Molecules are combinations of two or more atoms.
B. Molecules are the parts that make up atoms.
C. Molecules are the gaseous form of atoms.
D. Molecules are atoms that have a positive charge.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

fossil's are like over rated rocks like low key not gonna lie i don't get why we can't just call them old rocks like for real i mean i call my grandpa and grandma that smh