The animal often used to model human body systems is the pig.
The animal that is often used to model human body systems is the pig.
The animal that is often used to model human body systems is the pig. To determine the correct answer, we can analyze the given options and select the animal that is most commonly used in research and medical experiments to study the human body. You can also refer to scientific literature, articles, or textbooks to find supporting evidence. In this case, the pig is chosen due to its anatomical and physiological similarities to humans, making it a suitable model for various body systems.
