Water. H₂O.

Priests were placed in the first order in society and nobles in the second order. In the social process, the nobles enjoyed rights. The big landowners, the nobles, were the king's vassals, and the peasants were the landowners' vassals. The king was recognised by a nobleman as the senior who supported them with bread (seigneur/lord) and the kings would protect the vassals who would remain loyal to them in exchange. This was called vassalage. There was complete control over the land by the vassals. This control was the outcome of the Vassalage practice. The kings of France were linked to the people by ‘vassalage’.

Reactants are the chemical substances which participate in chemical reactions and forms new substances called as products. Products are the new substances which are formed in the chemical reaction between the reaction between reactants. H2+O2→H2O.

Life processes are the activities done by the body which are essential for living for.eg.respiration, excretion

HNO 3 + Ca ( OH ) 2 → Ca ( NO 3 ) 2 + H 2 O.

Basis of Classification is as follows:
- Level of Organisation
- Symmetry
- Layers of Cells
- Presence or Absence of Coelom
- Segmentation
- Presence or Absence of Notochord
Levels of Organisation
- Cellular Level. In some multicellular animals, the cell is responsible for all the metabolic activities in the animal body. This type of organization of function is termed as cellular level of organisation.
- Tissue Level. In certain animals cells performing the same function are arranged in a group. Example: Coelenterates.
- Organ Level. Some animals form specialized organs for specific functions.
Example: Platyhelminthes.
- Organ System Level. In higher and complex animals various organs group to form a complex organ system to perform specific function. Example:Molluscs, Chordata.

After the hailstorm destroyed his crops, Lencho and his family were in despair. They thought that they would have to remain hungry that year. But Lencho had great faith in God and he was only his last hope. So he wrote a letter to God to send him one hundred pesos to sow the fields again and also to survive till the new crop would grow.