Stomach ulcers could be caused bacteria and others
How should I know do you got a picture or something so I can see what you talking about
Answer:
Explanation:
Human impact on the ecosystem is something done by humans and gives the affect at the ecosystem like chopping down forests,and cars burning off greenhouse gases.Humans can effect the ecosystem in a negative way ,by pollution, waste dumping, over hunting of animals,over fishing,industrial gases,energy use
I would say your answer is <span><span>The Earth’s surface is responsible for a small fraction of heat radiation to space</span>
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Bacteria that develop a mutation: artificial
Over a period of several thousand years: natural
Organisms that best adapt to their environment: natural
Alaskan sled dogs: artificial
Farmers only allow: artificial