The excretory system allows animals to remove metabolic waste their bodies. Many of these substances are potentially toxic. in Mammals nitrogenous toxins like urea are expelled through liquid urine while in reptiles and birds the nitrogenous compounds are expelled as a solid. This allows birds and reptiles to use less water in the processes of metabolism.
B the origin of new matter in the steady state theory???
Answer:
Mutations can be caused by radiation
if my answer helps you than mark me as brainliest.
Answer:
Your answer is B. Multiple Personality Disorder
