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Following gastrulation, the next major development in the embryo is neurulation, which occurs during weeks three and four after fertilization. This is a process in which the embryo develops structures that will eventually become the nervous system
Trophic cascades are powerful indirect interactions that can control entire ecosystems
Since it is the hearts job to pump blood throughout the body of the organism, the circulatory system would fail and the entire organism would suffer if the heart cells stopped working properly.
They can harm other native species and thrive in the new environment which can potentially make the other species go extinct as the new species has no predators.