One Researcher Studies Plant Cells and How These Cells and Plants

One researcher studies plant cells and how these cells and plants respond to increased concentrations of carbon dioxide.Another researcher studies how multiple species interact and what affects their abundances and distributions.A different researcher studies a species' DNA and what changes have occurred between populations as a result of evolution.What do these researchers all have in common?

A) They all study community ecology since each researcher is interested in what happens within communities
B) They are all interested predator-prey interactions
C) They all study one of the many levels of biology with some application to ecology
D) They all study organismal biology since each researcher only studies the response of single-celled organisms