What do you think invasive species means? I think that it means that their species are very likely known to get invaded. 

What does it mean to invade something? It means to come in to someones space without them knowing, like a surprise attack or something like that. 

Can animals invade? Yes, because they have a brain which means they attack someone or something. 

What about plants? If the plant can move their whole body. 

How might invasive species affect other organisms in their environment? If someones invades themp then they might die, which would affect the food chain.