What do we call a group of organs which work together to carry out a particular fuction?

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

Nerve cells are specialized to respond to stimulitrue or false?