Final answer:
Bacteria are responsible for mixing with the secretions from the auxiliary sudoriferous glands to produce body odor. Specifically, species such as Corynebacterium and Staphylococcus break down the initially odorless fluid into compounds with a distinctive smell.
Step-by-step explanation:
The organism that mixes with the secretions from the auxiliary sudoriferous glands to produce an odor is A) Bacteria.
When discussing body odor, the auxiliary sudoriferous glands (also known as apocrine glands) secrete an oily fluid. This fluid is initially odorless, but when it comes into contact with bacteria on the skin, it is broken down into compounds that emit a noticeable odor. Different types of bacteria can contribute to body odor, but the main species involved are Corynebacterium and Staphylococcus.
These bacteria thrive in warm, moist environments like the armpits, where the glands are concentrated. It's important to note that while some yeasts can cause infections and may be present on the skin, they are not primarily responsible for the breakdown of sweat into odor-causing compounds.