D I'm not an expert but I would say D
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I think the correct answer would be distinguishing right from wrong and performing the right action. Ethical would always be related to moral principles, knowing what is the best and right thing to do and what are bad.
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The alternative pathway of complement useful in the early stages of an infection because <u>It's faster than the other complement pathways</u>.
The alternative pathway is one of three complement pathways that opsonize and kill pathogens. This pathway is activated by viruses, fungi, bacteria, immunoglobulin A and forms an important part of the defense mechanism independent of the immune response.
The alternative pathway (AP) is slowly activated spontaneously by hydrolysis of the internal C3 thioester bond [12–14] and further triggered by contact with various proteins, lipids and carbohydrate structures on microorganisms and other foreign surfaces [1, 15].
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Answer: Air
Explanation: Brainliest please!!