List out five important differences between chordates and invertebrates.

Estrogens are a class of steroid hormones primarily associated with the development and regulation of the female reproductive system in animals. While they are found in both males and females, estrogens play a crucial role in promoting the growth and maintenance of female sex characteristics. In animals, estrogens are synthesized primarily in the ovaries, although smaller amounts are also ________ _________ _____ _____ __________ ____.
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