A bone is tissue. It forms a part of the skeletal system which is made up bones, joints, ligaments and cartilage. Cells work together in groups known as tissues. A tissue is defined as a group of similar cells working together to carry out a certain task. Examples are skin, bone, blood. Tissues in turn are grouped together to form organs. An organ is defined as a group of tissues that work together to carry out a certain task . Examples are heart, lungs, liver.
Eukaryotes.
There are two main division of organisms in the wide spectrum of species. Eukaryotic organisms and prokaryotic organisms.
These organisms is divided based on the cell number they have. Further, eukaryotes have a dynamic function and strata in terms of cell structure and I'm not discussing in its internal parts but the external varieties invovled.
Eukaryotes are unison of different cells that function specifically however, interdependent of one another. That is why they are called cells, and group of cells are called tissues and so on.
1. Plastic water
2. Air pollution
3. Toxic Sludge dumping