Friday, July 31, 2015

Metals and non-metals



Metals and non-metals

The chemical elements can be broadly divided into metalsmetalloids and nonmetals according to their shared physical and chemical properties.

Elements

Cell - Structure and Functions


Cell - Structure and Functions

Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body’s hereditary material and can make copies of themselves.

Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell.
Introduction to cells