Carbon ,hydrogen ,and oxygen
The two-layered sac surrounding the heart is the pericardium.
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The answer is plankton are floaters. Plankton and nekton are both marine aquatic organisms. The main difference between the two is that plankton tend to float and be carried by water currents while nekton are organisms that swim against the current of the water. Plankton are passive swimmers while neekton are active swimmers.
The best and most correct answer among the choices provided by your question is the third choice or letter C.
When xylem and phloem gets destroyed, the roots will not be able to transport minerals and water.
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