The uricotelic animals are
1. Birds
2. Reptiles
3. Insects

The double walled cup like structure present at the starting of the renal tubule is Bowman's capsule. It encloses the glomerulus capsule. 

Glomerulonephritis is the inflammation of glomeruli of the kidney. 

Uremia is the accumulation of urea in the blood due to the malfunctioning of the kidneys. The urea accumulation is harmful and may lead to kidney failure.