The correct answer is A. This is the case of using comma before a coordinating conjunction <em>and</em> because it links two independent clauses. We can observe that there two parts of this full sentence and each part is independent from each other. Both of them have their own subject and verb. Therefore, we are using a comma before <em>and</em>.
Answer:
Longitudinal Waves and Transverse Waves Mechanical waves are categorized by their type of motion and fall into any of two categories: transverse or longitudinal. Note that both transverse and longitudinal waves can be periodic and Like transverse waves, longitudinal waves do not displace mass. The difference is that each particle which makes up the medium through which a longitudinal wave propagates oscillates along the axis of propagation. ... Matter in the medium is periodically displaced by a sound wave, and thus oscillates.
Explanation:
Answer: D) Mars is older than Earth.
Explanation: In the given excerpt from H.G. Wells' "The War of the Worlds" we can see the speaker giving information and some details about Mars. From the given options, the details that comes from supporting evidence in the excerpt is the corresponding to option D: Mars is older than Earth, as we can see in the phrase "It must be, if the nebular hypothesis has any truth, older than our world."
<span>Answer
b. the textual clue that refers to the pronoun</span>
A pronoun antecedent refers to the word that comes before the pronoun.
The pronoun has to agree with the noun especially in number since it is the
part of speech that replaces the noun. In other words, when the pronoun is singular
then that means that the antecedent must also be singular however if the
pronoun is plural so do with the antecedent. In determining whether the
antecedent is singular or not, it is very important to know what words between
the antecedent and the pronoun to ignore.
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