Make a list of the things you know about fractions

They can also be polynomials – this is a rational function. Mathematically, a fraction is a quotient of numbers, representing the number's value when the numerator is divided by the denominator (lower number). Thus 1/2 means one divided by two, or, in decimals, 0.5.

There used in math, the numerator is devided by the denominator

The correct answer is C. The dawn chorus of robins

Explanation:

In speeches and texts, the term tone refers to the author has about the subject or theme the author is speaking or writing about, this tone is usually expressed by the choice of words the author makes to refer to a situation or topic. Because of this depending on the author and the topic he or she is addressing the tone is different.

In the excerpt presented which belongs to "Silent Spring" a book written by Rachel Carson that explores the negative effects of the pesticides on the environment, the author aims at explaining the way spring was full of sounds of different birds but those have disappeared leading to a negative spring. Considering the author attitude is negative towards the situation of the silent spring but positive towards the past the phrase with the most positive tone is "the dawn chorus of robins" as this phrase refers to the past in which the spring had a lot of voices including those of the robins, a type of bird, also, this is only phrase depicting a positive aspect rather than the silent spring the author seems as negative.