An example of an organism is the human heart
the petals of a rose
a colony of ants
an oak tree

It's obviously not A.

an oak tree

Explanation:

All the other options are either parts of an organism ( rose petal and human heart) or, multiple organisms ( a colony of ants) but, an oak tree is one single living organism.

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

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