How are species introduced to new ecosystems?

They start as single cell orginisms then they evolve from there. 

hope that helps

Species are introduced by their adaption to the community population
I hope this helps

Since the black bears eat both fruit and meat that makes them an omnivore

Here is your answer:                                                                                                                                                                                                                                                   formula for volume: base*width*height=                                                                                                 5*2*10=100                                                                                   your answer is 100cm.