scrotum

"My sister is a female student in her senior year of high school. "

"My sister brought several books to the library, and that one is about dinosaurs. "

"My pet cat is a mammal, and so are my dogs. "

"My mother packed a large cloth bag for my weekend trip. "

"It looks weaker and weaker, the more I think about it."

"The box contains my old toys. "

"He is so disgusting he makes my skin crawl."

"The doctor explained that the labia are folds of skin that protect the opening of the vagina. "

"Muscle consists largely of actin and myosin filaments."

"My brother is a male. "

"The veterinarian examined the dog's testicles to check for any signs of swelling or abnormality. "

"Even though they have different functions, a bird's wing and a human arm are considered homologous structures because they share a similar bone structure and origin. "