Which of the following is a complex sentence?

The correct use of "fewer" and "less" is important in proper grammar and usage. "Fewer" is used when referring to items that can be counted, while "less" is used for quantities that cannot be counted. In this case, "people" is a countable noun, so "fewer" is the correct word to use. Additionally, "effect" is the correct noun to use in this sentence, as it refers to the result or consequence of the action, while "affect" is a verb meaning to influence or have an impact on.

Choice A: In this option, the subject "The boys and girl" is a compound subject that includes both "boys" and "girl." The mistake here lies in the verb "is," which is singular. Since the subject is plural due to the presence of "boys," the correct verb should be "are."

Choice B: This choice correctly follows subject-verb agreement rules. The subject "The boy" is singular, so the verb "come" is appropriately singular. Similarly, for "the girls," which is plural, the verb "come" is used in its plural form.

Choice C: Here, the subject "The boys" and "the girls" are connected by "or," indicating a singular choice. However, the verb "sings" is in the singular form, which is incorrect for plural subjects. To maintain agreement, the correct verb should be "sing."

Choice D: In this option, the compound subject "The boys and girl" is again presented. However, the verb "visits" is singular, not in agreement with the plural subject. To ensure proper subject-verb agreement, the verb "visit" should be used.

A compound sentence is a sentence that consists of two or more independent clauses joined by a conjunction. Example: "I like my job, but I like this more." This sentence has two independent clauses, "I like my job" and "I like this more," joined by the conjunction "but."

A complete sentence must have a subject and a predicate that expresses a complete thought. Option B, "I walked all three dogs around the park this morning," is a complete sentence because it has a subject ("I") and a predicate ("walked all three dogs around the park this morning") that expresses a complete thought.

The commas correctly set off "or jiaozi," which is an extra detail. The other sentences either need a comma for direct address, have comma splices, or have incorrect punctuation.

The sentence written correctly is: "The lizard has the ability to alter its coloration to blend in with the foliage." The word "alter" is spelled correctly, and the pronoun "its" is used correctly to show possession. The word "altar" in options B and D is a different word that means a raised platform used for religious or ceremonial purposes, and the word "it's" in option B is a contraction of "it is," which does not make sense in the context of the sentence.

The Krebs cycle, part of cellular respiration, happens in the mitochondria. Fermentation and glycolysis happen in the cytoplasm, and photosynthesis occurs in plant cells' chloroplasts.

In the given sentence, "the class" is a singular noun and requires a singular possessive pronoun. "Its" is the correct form of the possessive pronoun "it" to use with a singular noun, as opposed to "it's," which is a contraction of "it is" and would not be appropriate in this context. "They're" is a contraction of "they are" and would not be appropriate because "class" is singular, not plural.

The word that defines "subterranean" based on the prefix "sub-" is B. Underground.

Proofreading is the final step, where you check for spelling and grammar mistakes. The other steps happen earlier in the writing process.