Final answer:
All organisms, including squirrels, oak trees, acorns, and foxes, have DNA made up of the same nucleotides as humans. The sequence in which these nucleotides are arranged differs among species, granting each its unique characteristics.
Step-by-step explanation:
The question you've asked pertains to which organisms contain the same nucleotides as humans. All organisms on Earth, including squirrels, oak trees, acorns, and foxes, use the same basic nucleotides in their DNA: adenine (A), thymine (T), guanine (G), and cytosine (C). Therefore, each of these organisms has DNA composed of the same nucleotide building blocks as humans. However, the sequence and length of the DNA differs among species, which is what makes each species unique. For example, foxes, being mammals, would have a more similar sequence of DNA to humans compared to oak trees, as mammals share a more recent common ancestor with humans than plants do.