What is the advantage for birds of not having a bladder?

Explanation:

The urinary bladder is a flexible sac that can expand and contract and that holds urine.

Urea is excreted mainly by birds and it happens to be the main chemical in urine, without the water in it, the birds excrete just solid droppings instead of as a liquid.

Now, birds physiology is such that they have only one opening to get rid of their (solid) waste and they do not have a bladder.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.

what are the awnser choices? i mean, without choices, it is an incompleat