The answer is population density
Protozoans, bacteria, fungi... viruses are not organisms
Answer:
C. Excretion
Explanation:
Excretion is the removal of metabolic waste and excess water from the body.
Excretion occurs in the lungs, kidneys and skin.
Answer:
It's The amount of matter within the system remains the same and The cycle has a well-defined starting and stopping point.
Explanation:
