Biology and Math: You have read that the total length of all your blood vessels is about 96 000 kilometers,
enough to go around Earth about two and one-half
times. Use this information to calculate the
circumference of, or distance around, Earth.

the fossil record provides evidence of a common ancestor to many species.

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.

i got you i did it ya know what it is just needing to fill this in for a quick task!