A new organism is discovered at the bottom of the ocean. A scientist is determining the composition of elements found in the tissues of the organism. Which elements will most likely be found?

Living organisms are made mostly of carbon, hydrogen, nitrogen, and oxygen, which form the molecules needed for tissues. The organism’s deep-ocean habitat does not change the basic elements expected in living tissue. Choice D lists all four; the other choices include metals such as gold, silver, or aluminum instead of key biological elements.

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