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.
It's metophase you are looking for :)
The two gasses that make up 99% of the earth's atmosphere are nitrogen and oxygen.
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Answer:
a plasma membrane, also called a cell membrane, and cytoplasm.
Explanation:
DNA
