An excretory function is one that collects and removes harmful waste products from the body. Which of the following pairs of organ systems do NOT have an excretory function? a) lungs, large intestine
b) heart, kidney
c) skin, lungs
d) kidney, lungs

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

it's c. (to reduce the greenhouse effect/carbon gasses)

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

sorry if this did not , have a great day!