Final Answer:
In vivo refers to experiments or studies conducted within a living organism, in situ involves observations within the natural environment, in vitro takes place in a controlled laboratory setting, ex vivo is conducted outside the organism after removal, and in silico refers to computer simulations.
Step-by-step explanation:
In vivo experiments occur within a living organism, allowing researchers to study biological processes in their natural context. In situ observations take place within the natural environment of the subject, providing insights into real-world conditions. In vitro studies involve controlled laboratory conditions, often using isolated cells or tissues.
Ex vivo experiments occur outside the organism after removal, enabling researchers to manipulate tissues. In silico refers to computer simulations that model biological processes, providing a virtual platform for experimentation.