There are 5 levels of cell organization recognized by biologists.
Limestone.
It is a sedimentary rock composed of calcite and aragonite. It is used as a building material mainly because it is easily available and easy to work with.
Limestone is used in the manufacture of steel as it is the primary raw material that helps to remove impurities from the iron ore and produces waste matter that has low melting point and viscosity
C. Mutualistic relationship
Flowers and hummingbirds have a mutualistic relationship where both benefit. Flowers produce food in the form of nectar (sugar and water) to attract hummingbirds which, in turn, move pollen for the plant (pollination).
It has not. Evolution is not a process that can happen to individual organisms; it's change that happens to a species over many generations.
Scientists classify rocks based on texture, composition, and how the rocks formed.] Rocks are classified by how they formed.
