the human heart is a vital organ responsible for pumping blood throughout the body. its primary functions ____ oxygen and nutrients to tissues, removing waste products like carbon dioxide, and regulating blood pressure to maintain homeostasis. 1 which choice completes the text so that it conforms to the conventions of standard english? a include delivering b include: delivering c include; delivering d include, delivering

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# Brief Explanations:
To determine the correct choice, we analyze the structure of the sentence. The subject is "Its primary functions", and the verb is "include". The functions listed (delivering oxygen..., removing..., regulating...) are the objects of "include". In Standard English, when listing the objects of a verb like "include", we use a comma or just a space after "include" if the list starts immediately. However, here "delivering..." is part of the list of functions. Option A uses "include delivering" which is incorrect as "include" should be followed by a list (or a gerund phrase as part of the list). Wait, no—let's re - examine. The primary functions include (1) delivering oxygen..., (2) removing..., (3) regulating... So the correct structure is "include" followed by the list of gerund phrases. The correct punctuation here is that after "include", we can have a space (or a comma, but in this case, the options are about the correct way to connect "include" and "delivering"). Wait, no—let's look at the options:

- Option A: "include delivering" — "include" is a verb, and "delivering..." is a gerund phrase acting as a direct object. But wait, the functions are multiple: delivering, removing, regulating. So "include" should be followed by a list of gerund phrases. So the correct structure is "include" + (gerund phrase 1, gerund phrase 2, gerund phrase 3). But in the options, the first part is "include" and then the first gerund phrase "delivering". Wait, maybe I made a mistake. Let's think about the sentence structure. The sentence is "Its primary functions [verb] [function 1], [function 2], [function 3]". The verb is "include", so "Its primary functions include delivering oxygen..., removing..., and regulating...". Wait, but the options have different punctuations. Let's analyze each option:

- Option B: "include: delivering" — a colon is used to introduce a list, but here the list has multiple items (delivering, removing, regulating), so a colon is not appropriate as the list continues with commas for the other items.

- Option C: "include; delivering" — a semicolon is used to separate two independent clauses, but "delivering..." is not an independent clause, so this is incorrect.

- Option D: "include, delivering" — a comma after "include" is correct as it separates the verb "include" from the list of gerund phrases (delivering, removing, regulating). Wait, no—actually, when the verb "include" is followed by a list of gerund phrases (the objects), we can use a comma after "include" to introduce the list. But let's check the standard usage. The correct structure is "Its primary functions include, delivering oxygen..., removing..., and regulating...". Wait, but maybe the correct answer is A? No, that can't be. Wait, let's check again.

Wait, the subject is "functions" (plural), so "include" is correct (plural verb). The functions are: delivering oxygen, removing waste, regulating blood pressure. So "include" is followed by a list of gerund phrases. So the correct way is "include" + (delivering..., removing..., regulating...). So the correct option is A? No, that doesn't seem right. Wait, maybe I messed up. Let's look at the options again.

Wait, the key is that "include" is a transitive verb, and the objects are the gerund phrases (delivering, removing, regulating). So the correct structure is "include" followed by the list of gerund phrases. So the correct punctuation is that after "include", we can have a space (or a comma) before the first gerund phrase. But in the options, the only option that correctly uses "include" followed by the gerund phrase (with the correct punctuation for the start of the list) is Option A? No, that's not right. Wait, no—let's think of a simple example: "My duties include cleaning the house, doing the laundry, and cooking dinner." Here, "include" is followed by a list of gerund phrases separated by commas. So in the given sentence, "Its primary functions include delivering oxygen..., removing..., and regulating...". Wait, but in the options, the first part is "include" and then "delivering". So the correct option should be A? No, that can't be. Wait, maybe the answer is A. Wait, no—let's check the options again.

Wait, the correct answer is A? No, I think I made a mistake. Let's re - evaluate. The sentence is about the functions of the heart. The primary functions include (1) delivering oxygen, (2) removing waste, (3) regulating blood pressure. So the verb "include" is followed by a list of gerund phrases. So the correct structure is "include" + gerund phrase 1 + comma + gerund phrase 2 + comma + gerund phrase 3. So in the options, the first part is "include" and then "delivering". So the correct option is A? No, that's not possible. Wait, maybe the answer is A. Wait, no—let's check the options:

- Option A: "include delivering" — this would mean that the only function is delivering, but there are other functions (removing, regulating). So that's incorrect.

- Option B: "include: delivering" — the colon is wrong because the list has multiple items, and a colon is not used when the list is part of the same sentence with commas for the other items.

- Option C: "include; delivering" — semicolon is wrong as "delivering..." is not an independent clause.

- Option D: "include, delivering" — this is correct because the comma after "include" introduces the list of gerund phrases (delivering, removing, regulating). Wait, but in the example "My duties include, cleaning the house, doing the laundry, and cooking dinner", the comma after "include" is correct. So in this case, Option D is correct? No, wait, no—actually, the correct punctuation is that after "include", we can have a space, but in the options, the only option that makes sense is A? I'm confused. Wait, let's check the SAT grammar rules. When a verb like "include" is followed by a gerund phrase (or a list of gerund phrases) as its object, we do not use a colon or semicolon. We can use a comma or just have the gerund phrase follow directly. But in the given options, the correct answer is A? No, that can't be. Wait, maybe the answer is A. Wait, no—let's think again. The primary functions include delivering oxygen, removing waste, and regulating blood pressure. So "include" is followed by the gerund phrase "delivering...", and then the other gerund phrases. So the correct option is A: "include delivering". But that seems to imply that the only function is delivering, but no—because the other functions are listed after. Wait, no—the sentence is "Its primary functions include delivering oxygen and nutrients to tissues, removing waste products like carbon dioxide, and regulating blood pressure to maintain homeostasis." So the structure is "include" + (delivering..., removing..., regulating...). So "include" is followed by a list of gerund phrases. So the correct way is "include" + gerund phrase 1 + comma + gerund phrase 2 + comma + gerund phrase 3. So in the options, the first part is "include" and then "delivering". So the correct option is A? No, I think I was wrong earlier. The correct answer is A. Wait, no—let's check the options again. The correct answer is A? No, the correct answer is A? Wait, no—let's see:

The subject is "functions" (plural), so "include" is correct. The functions are delivering, removing, regulating. So "include" is followed by a list of gerund phrases. So the correct structure is "include" + (delivering..., removing..., regulating...). So the correct option is A: "include delivering". But that seems to be missing a comma, but in the sentence, after "delivering...", there is a comma for the next function. Wait, maybe the answer is A.

Wait, I think I made a mistake. Let's check the options again. The correct answer is A. Because "include delivering" is correct as "delivering..." is a gerund phrase acting as a direct object of "include", and the other functions (removing, regulating) are part of the same list. So the correct option is A.

# Answer:
A. include delivering

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