Explanation:
C. Eubacteria and Archaebacteria
Answer:
Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body. Urea is carried in the bloodstream to the kidneys, where it is removed along with water and other wastes in the form of urine.
Explanation:
B) Oxygen may not have been able to accumulate in the atmosphere
Answer:
A. the population must be very large
