Answer:
burning of coal
Explanation:
Coal contain carbon which combines with oxygen.
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.
Answer:
Answer: The collection of all the genes and the various alternate or allelic forms of those genes within a population is called gene pool.
