If those are the optional answers, it's most likely sodium.
Explanation:
human affect biodiversity by their population numbers, use of land,and their life styles,causing damage to habits for species .Through proper education,and by demanding that governments make decisions to preserve biodiversity,the human population will be able to sustain life on earth longer.
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The correct answer is option A, that is, theories.
A restricted explanation of a phenomenon is referred to as a hypothesis. A statement regarding an observed phenomenon or a unifying concept is considered as a law. A law differs from a scientific theory in that they do not postulate an explanation or mechanism of the phenomenon, they are just a filtration of the outcomes of recurrent observation.
However, a scientific theory refers to a thorough explanation of the observed phenomenon.
Bromothymol blue (BMB) is an indicator dye that turns yellow in the presence of acid. When
carbon dioxide is added to the solution, it creates carbonic acid, lowering the pH of the
solution. BMB is blue when the pH is greater than 7.6, green when the pH is between 6-7.6, and
yellow when the pH is less than 6