What is the difference between an intron and a exon

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.

When analyzing tree rings, what do scientists assume a thin ring indicates?

Which event would lead to primary succession of a forest?