Which of the following is the best description of a virus?
A) A virus is a life-form that can reproduce inside cells or independently.
B) A virus is a tiny spore-producing cell.
C) A virus is a noncellular, replicating entity.
D) A virus is the smallest living thing.
Answer: C
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Which of the following scenarios describe an ecological succession?
A. The site of a volcano eruption that is going back to its pre-eruption state B. The regrowth of a forest after a fire C. An old field left abandoned that transforms back into a forest over time D. All of the above are examples of ecological succession
Over-the-counter medications for acid reflux or heartburn block the production of stomach acid. Which of the following cells are directly affected by this medication?
A) goblet cells B) chief cells C) parietal cells D) smooth muscle cells
In what way is clinal variation exhibited in animals?
What will be an ideal response?
The accepted scale of glass hardness is the _____ scale.
What will be an ideal response?