What type of study is performed under tightly controlled situations and often involves animals?

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

An animal cell (left) and a plant cell (right) are shown.which organelle, labeled x in the diagram, is found in both plant and animal cells?

Oak and maple trees, chipmunks, white-tail deer, and black bears emerging from hibernation are all organisms that may be found in which biome