Answer:
A
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Explanation:
Answer:
A liver or kidney.
Step-by-step explanation:
Once in the bloodstream, thyroxine travels to the organs, like the liver and kidneys, where it is converted to its active form of triiodothyronine. Thyroxine plays a crucial role in heart and digestive function, metabolism, brain development, bone health, and muscle control.
Lymph nodes. They comprise the lymphatic system that
connects to the blood circulatory
system. They are significant in the
immune system. At the lymph nodes, foreign bodies
in the lymph, such as pathogens, are filtered
and trapped in lymph nodes where they are later destroyed by lymphocytes.
Primary structure, which is simply the sequence of amino acids in a polypeptide molecule.
They breathe through their skin. Air dissolves on the mucus of their skin, so they MUST stay moist to breathe. If worms dry out, they suffocate. As fresh air is taken in through the skin, oxygen is drawn into the worm's circulatory system, and the worm's hearts pump the oxygenated blood to the head area.