Answer:
Mantle is composed of rocks where as core is composed of metals.
Explanation:
Mantle and core both are part of the earth's crust. Though there have a difference between them- The mantle is consists of semi solidified rocks and core is consists of hot metals like iron and nickel. Core is the inner most layer surrounding the earth's center. The portion of the interior beyond the crust is called mantle. The core is the densest layer of the earth with its density ranges from 9.5-14.5 g/cm^3 where the density of mantle varies between 2.9-3.3 g/cm^3.
Answer:
D) Cell - Tissue - Organ - Organ system
Explanation:
Cell organization starting from cell to organ system shows the relationship among different levels of cell organization. The cell organization helps to know the structural and function of the organisms.
The correct order of cell organization:
Cell – tissue - organ - organ system
Different organsystems organise to for an organism. The cell is the simplest level and a group of cells (tissue) is the next higher level, a group of a tissues (organ) and a group of organs makes organ system which is the complex level of organization.
Levels of organization in ecology include the population, community , ecosystem, and biosphere.
