The answer is ecological
niche. A species carving of its ecological niche is dependent on the distribution of
resources in the environment and its competitors. It begins with behavioral adaptations. A species niche includes its nutrition, relationship with other species in the ecosystem, and habitat. There
are two types of niches; realized niche (niche acquired when there is competition)
and fundamental niche (niche acquired even without competition).
 
        
             
        
        
        
Not for long. We use oxygen for cellular respiration and plants make oxygen so if all the plants died, we would only have so long to live
        
             
        
        
        
Answer: Alveoli 
Explanation: Alveoli of lungs are surrounded by extensive blood capillaries. The partial pressure of oxygen in the alveoli is higher than the blood entering the pulmonary capillaries, hence oxygen moves into the blood. Carbon dioxide in the lungs simultaneously diffuse out of the blood into the alveolar space.