P. boisei, H. habilis, and H. egaster could have been sympatric, meaning that they... Group of answer choices had overlapping geographic ranges utilized very different geographic niches. had very robust craniofaciodental anatomy. consumed a lower quality diet than Au. garhi . were all monogamous.

in a word, a scientific question is testable. a testable question is one that asks about objects, organisms or events found in the world around it

what bodys are there orbiting?

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.