The gravity of a black hole is so strong that not even light can escape. Even if a bright star is shining right next to a black hole, you cannot see the black hole. Instead of reflecting the light as other objects do, the black hole just swallows the starlight forever.
In mammals, the powerful muscle that aids in breathing is the diaphragm. This muscle expands and contracts the chest cavity and forces air in and out of the lungs. Hope that helped =)
An oil boom helps contain the oil so that it is easier for them to skim it off of the water. They aren't meant to clean up oil, only to contain the oil since it does not sink or mix with water.
