Microvilli are found in the lungs and are the site of gas exchange microscopic folds where nutrients are absorbed cells in the immune system that attack foreign invaders found in the gallbladder and secrete bile

Im not sure but

Explanation:

Microvilli are .

found in the gallbladder and secrete bile

cells in the immune system that attack foreign invaders

microscopic folds where nutrients are absorbed

found in the lungs and are the site of gas exchange

there are men and women, some choose to be both or change their gender. often times those people go by "other". those who change their gender are known as "transgender"