What is rarefaction and how does this relate to density?

Sarah is sitting at the top of the slide in the schools playground. which will increase sarah’s kinetic energy a- an additional child is added to the top of the slide. b- sarah is pushed and moves down the slide. c- sarah climbs down the ladder and off the slide. d- the ladder is moved to the other side of the yard.

Solutions to environmental problems in europe must

Is there any solid scientific evidence that humans have been cloned?