<span>the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
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Answer:
Well , I think the answer is B
This represents a closed system,and one benifit is that the risk of passing disease between other species is lower than in open system
But still I prefer you to check it out in your book
B . its a 50 50 chance because the traits are stronger
Answer:
Limiting human use of nitrogen that is in the atmosphere.
Explanation: