Which of the following is always true of two organisms in the same taxonomic class?

• A. They occupy the same habitat.
• B. They are capable of interbreeding.
• C. They belong to the same phylum.
• D. They have identical DNA sequences.

Answer: (C)

Verified step by step guidance

1. Understand the hierarchy of biological classification: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
2. Recognize that organisms in the same class are grouped under the same phylum, as 'class' is a lower taxonomic rank than 'phylum'.
3. Consider that organisms in the same class may not necessarily occupy the same habitat, as habitat can vary widely within a class.
4. Acknowledge that organisms in the same class are not necessarily capable of interbreeding, as interbreeding typically occurs within the same species.
5. Realize that having identical DNA sequences is not a requirement for organisms in the same class, as genetic variation exists within a class.