Developing bird embryos excrete most of their nitrogenous waste as uric acid because .

Explanation:

1. Developing bird embryos excrete most of their nitrogenous waste as uric acid,there are many reasons of  this, one the reason is that   it has a low solubility in water and it  is less toxic to the embryo as compared to other forms of waste.

2. Birds and many other organisms like reptile excrete nitrogenous waste in the form of uric acid, because it reduces water loss compared to other nitrogenous wastes, but it  requires more metabolic energy as compared to others to produce.

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when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave