Final answer:
Guinea pigs and nonhuman primates are both frequently used in scientific experiments.
Step-by-step explanation:
False. Guinea pigs and nonhuman primates are both frequently used in scientific experiments. They are among the many animals used for medical experiments, drug testing, product testing, and psychological research in biomedical laboratories. While mice, rats, and birds are the most commonly used animals in US labs, guinea pigs and nonhuman primates are also utilized.