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Some harmful effects of chordates can include overpopulation causing environmental imbalances, transmission of diseases to humans or other animals, and competition for resources leading to disruption of ecosystems. Additionally, certain chordates can be invasive species, displacing native species and causing harm to local biodiversity.
Dog turds
Environmental DNA (eDNA) Surveillance.
Not all introduced species are invasive; an invasive species is specifically one that causes harm to the environment, economy, or human health in its new habitat. For example, the common house cat, while introduced to many regions, can have detrimental effects on local wildlife, making it invasive in some areas. In contrast, the European honeybee, although introduced to many parts of the world, primarily aids in pollination and has not shown the same harmful impacts, thus not being classified as invasive.
Being a large family of animals, I have a hard time imagining how vertebrates could have "harmful effects". But if it is really the question you mean to ask, you might want to specify on what these harmful effects are supposed to be.
ok first of all you mean how can mollusks be harmful and think of invasive species
Extinction of species.
Hairy-bellied worms, includes approximately 790 currently known species of small, bilaterally symmetrical, acoelomate organisms found in marine, brackish, and fresh waters worldwide. Nowhere in the literature is any information on their harmful effects on their environment nor on humans. There is a little bit about harmful effect caused by humans on them.
Pandas are not an invasive species.
A noxious weed is another term for an invasive plant species.
Harmful invasive species can disrupt ecosystems by outcompeting native species for resources, preying on them, or introducing diseases. This can lead to a decrease in biodiversity, changes in ecosystem structure, and loss of native species. The consequences of their presence may include reduced food availability, altered habitat conditions, and overall ecosystem instability.
An "invasive species" is defined as a species that is 1) non-native (or alien) to the ecosystem under consideration and 2) whose introduction causes or is likely to cause economic or environmental harm or harm to human health.