The dot and cross diagram shows that a water molecule is made up of one oxygen atom joined to two hydrogen atoms, so the formula of water is H 2 O. A nitrogen molecule is made up of two nitrogen ...

Deoxyribonucleic acid (DNA) is the information-carrying molecule found in all living organisms. In most animal, plant and fungal cells DNA is stored in the nucleus coiled up in thread-like ...

Global mean surface warming throughout the 21st century will be largely determined by cumulative emissions of carbon dioxide (CO 2) and the other long-lived greenhouse gases, and what proportion of ...