An item that is free of all viable microbes including endospores is considered to be a <u>sterile item</u>.
Such a substance or equipment that is free from all kinds of microbes, spores, or any other infectious agent is referred to as a sterile item. There are various sterilization techniques and procedures that are used in order to make a sterile item.
in labs, where researches have to be made, all items need to be sterile as an invasion of any other microorganism can make a research study go wrong.
Some of the common means through which sterilization is achieved are using heat, chemicals, irradiation, etc.
After an item has undergone a proper sterilization method, it is referred to as a sterile item that can now be used.
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I think the best answer would be A. since the number of prairie dogs decreased from the picture on the left to the picture on the right. Hope this helped :p
Occurs naturally on earth
Bioaccumulation refers to the accumulation of a toxic chemical in the tissue of a particular organism.
Biomagnification refers to the increased concentration of a toxic chemical the higher an animal is on the food chain.