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Which echinoderm group was much more abundant in the past than it is today?
Stomach Acids
The digestive fluids secreted by the stomach's lining, containing hydrochloric acid and digestive enzymes, crucial for breaking down food.
Antibodies
Proteins produced by the immune system to neutralize or destroy toxins or disease-causing organisms.
Antibody Molecule
A protein produced by the immune system to identify and neutralize foreign objects like bacteria and viruses.
Antigen-binding Site
The specific region on an antibody molecule that binds to an antigen, determining the antibody's specificity and enabling immune recognition.
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