Name the carbohydrate which forms cell wall​

The asian shore crab (hemigrapsus sanguineus) is an invasive species that has impacted the atlantic coast. predict what characteristic of this invader would most likely disrupt the biodiversity of this area.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

What factors contribute to the effect an environmental toxin has on the human body?