Here are the key events listed in chronological order with
their corresponding year.
1. Hooke coins the word cell after viewing cork cells with
primitive microscope. (1665)
2. van Leeuwenhoek discovers bacteria with his improved
microscope. (1676)
3. Brown recognizes and names the cell nucleus. (1831)
4. Schleiden & Schwann propose cell theory. (1839)
5. Virchow describes cell division; proposes that all cells
arise from other cells. (1855)
<span>6. Pasteur disproves spontaneous generation and proposes germ
theory. (1861)</span>
DNA is the molecule that carries the genetic code. These are found in the nucleus of cells. They copy themselves during replication when a cell divides and splits.
It explains the relationships between molecules of gases, liquids and solids.
If a compound is made of one metal and one non-metal it's bond will be ionic, whereas if a compound is made of two non-metals, it's bond will be covalent.
C - Non-Metal
O - Non-Metal
CO = Covalent.
The phenomenon is known as the Greenhouse Effect.
When the sun's energy reaches the Earth, some is reflected into space, but the rest is absorbed by gases and warms the atmosphere. The phenomenon is known as the Greenhouse Effect.