<span>Enzymes are called biocatalysts because they function in chemical reactions that involve living organisms [biologial organisms]. Enzymes generally increase the rate of metabolic reactions by lowering the activation energy, making it easier for the reaction to occur easily and rapidly. Without enzymes, some metabolic reactions may take a very long time before they are completed. Enzymes used in laboratory chemical reactions are not biocatalysts because they are not catalysing reactions in biological organisms. </span>
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Explanation:
Vestigial structures are parts of an animal's body that serve no function, but did in earlier evolutionary stages. Two examples of this are the human appendix and the snake pelvic bone.
A Joint<span> is where two adjacent bones or cartilages or combinations thereof meet. They provide the mechanism that allows the </span>body<span> to move. They are classified according to their degree of movement as </span>movable<span>, partially </span>movable<span> and immovable </span>joints<span>.</span>
One of the most common cause of hypersecretion of the endocrine glands would be tumors. Specifically, the presence a hormone secreting endocrine-cell tumor. Hypersecretion is when the gland is secreting too much of a hormone. Hope this helps.
