Emphysema results when the delicate linings of the air sacs in the lungs become damaged beyond repair. Most commonly, the toxins in cigarette smoke create the damage. The lung changes of emphysema evolve slowly over years: 1  As the fragile tissues between air sacs are destroyed, air pockets in the lungs develop.2  Air becomes trapped in these spaces of damaged lung tissue.ost commonly, the toxins in cigarette smoke create the damage. The lung changes of emphysema evolve slowly over years: 1  As the fragile tissues between air sacs are destroyed, air pockets in the lungs develop. 2  Air becomes trapped in these spaces of damaged lung tissue.
In almost all toothed whale species, their teeth are cone-shaped and not used for chewing (the exception are Amazon River dolphins; they have two different types of teeth in their mouths). They hunt and catch one prey animal at a time, such as fish, squid, seals, sea lions and even birds.
Sperm whales are the largest toothed whales on the planet, and perhaps the most abundant of the great whales, but we rarely get to study them because they spend so much time underwater. Sperm whales are deep divers, holding their breath and diving thousands of feet down to feed on deep sea squid and fish. They spend 90% of their lives down deep where they can't be seen. Only rarely do these energetic animals take a break and rest at the surface.