The correct answer is (d). Birds and Lizards both excrete uric acid.
Uric acid is a nitrogenous waste product that is produced when the body breaks down proteins. It is a white, crystalline solid that is soluble in water. Uric acid is normally excreted in the urine.
Birds and lizards are both uricotelic animals, which means that they excrete uric acid as their main nitrogenous waste product. Uric acid is a relatively insoluble substance, so it is less toxic than other nitrogenous waste products, such as ammonia and urea. This is an advantage for animals that live in dry environments, as it means that they do not need to drink as much water to excrete their waste products.
Humans are ureotelic animals, which means that they excrete urea as their main nitrogenous waste product. Urea is a more soluble substance than uric acid, so it is easier for humans to excrete. However, urea is also more toxic than uric acid, so humans need to drink more water to excrete their waste products.
In conclusion, the nitrogenous waste-uric acid is excreted out by Birds and Lizards both.