How long can a healthy ecosystem remain stable

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.

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?