<span>It
is important to characterize and identify unknown environmental bacteria
because it is a potential pathogen. This means that it could be harmful to
anyone. Thus, it is necessary to characterize and identify them in order to
distinguish one organism from another and to group similar organisms by
criteria of interest. Hence, bacteria are everywhere and they are part of our
environment and even of us and through. Through identifying them can help us
determine the cause of a disease or to test if a certain food is safe to eat or
simply to know what is present in a certain ecosystem. </span>
The appearance of banded iron layers in the rock record between 1.08 and 3.8 billion years ago reflect the alteration of oxygen-rich and oxygen-poor conditions in the ocean at that time is True.
<u>Explanation:</u>
Banded rocks have layers of iron oxide and cherts that contain silica. The layer containing iron oxide has a dark color and the chert layer is red in color. Haematite and magnetite are usually the iron oxides that make up the banded rocks.
Banded rocks were formed by the reaction of iron in the oceans with the oxygen produces by photosynthetic bacteria in the ocean. The reaction caused the formation of iron oxides and their precipitation as Banded iron formations.
The presence of free oxygen is crucial for the formation of banded rocks and the formation reduced drastically after 1800 mya period when atmospheric oxygen availability was reduced. Banded rocks represent the oxygen rich and oxygen-poor condition of the ocean at that time.
Answer:
The mass is 5 grams because the mass hasn't changed. only the state of matter.
The answer is that it is a big tooth
