Jerry is conducting an experiment to test friction. his setup is shown below. if he wants to test the fiction between different types of
materials , what should he change in the setup above?
mass
wooden block
spring scale
string

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.