Which of the following words has to be spelled differently if your adding a suffix

Which traits are strongest in your persuasive essay: ideas, organization, voice, word choice, sentence fluency, or conventions?

Select the correct answer. which of these lines from “the raven” by edgar allan poe to create the dark and gloomy tone of the poem? a. "'tis some visiter entreating entrance at my chamber door— some late visiter entreating entrance at my chamber door; b. once upon a midnight dreary, while i pondered weak and weary, over many a quaint and curious volume of forgotten lore— c. "and so faintly you came tapping, tapping at my chamber door, that i scarce was sure i heard you"—here i opened wide the door— d. bird or beast above the sculptured bust above his chamber door, with such name as "nevermore." hurry

What is a mechanism by which organisms maintain homeostasis when the level of one substance influences the level of another substance or the activity of an organ.