proteins and nucleic acid :)
Feces and urine
other wise they accumulate in the body and cause death.
Urea
kidney, skin,
urethra
Nephridia are similar to the kidneys in the human body. Both nephridia and kidneys are responsible for filtering waste and maintaining proper fluid balance in the body. They play a crucial role in excreting metabolic waste and regulating ion concentrations.
Mammals have nervous, digestive, circulatory, skeletal, immune, muscular, integumentary, and excretory systems.
The excretory system of meerkats is similar to that of other mammals. They have kidneys and a urinary bladder, and their urine is liquid.
It is a major nitrogenous end product of protein metabolism and is the chief nitrogenous component of the urine in mammals and other organisms. It has various applications in many fields such as agriculture, chemical industries, medical use, and other areas.
They kidneys get rid of the urea produced by the liver. The skin also excretes a small amount of urea in the sweat.
The primary nitrogenous waste for chicken is uric acid. Chickens excrete uric acid as a white, semi-solid paste along with their feces, which helps conserve water and maintain a good balance of electrolytes in their bodies. Uric acid is the result of the breakdown of proteins in the liver and is less toxic than other nitrogenous waste products like ammonia or urea.
Mesonephric kidneys are the primitive excretory organs found in fish and amphibians, while metanephric kidneys are the more advanced excretory organs found in mammals, including humans. Metanephric kidneys filter blood to produce urine through nephrons, while mesonephric kidneys mainly function to remove waste products from the blood.