I help fight against diseases. Red blood cells
I carry impure(deoxygenated) blood to the lungs from the heart.
Plasma
I help transport respiratory gases (oxygen and carbon dioxide) to
different parts of the body.
Valve
I am the fluid part of the blood.
White blood cells
I am a special structure and prevent backflow of blood,
Pulmonary artery

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.

answer; ///associate's degree;