Amoeba is a single-celled organism, classified as a unicellular organism.

Calorific value refers to the amount of energy released when 1 kg of a fuel undergoes complete combustion. It indicates the efficiency of the fuel in producing heat energy.

A higher calorific value means the fuel releases more energy per unit mass, making it more effective for heating or power generation.

Desertification is the transformation of fertile land into desert, primarily caused by deforestation, overgrazing, drought, and poor agricultural practices, leading to soil degradation and loss of biodiversity.

Endemic species are plants and animals that exist exclusively in a particular geographic region. They are not naturally found in any other area, making them unique to that location.

Multicellular organisms are composed of more than one cell, enabling them to perform specialized functions. This complexity allows for diverse structures and systems, essential for survival and adaptation.

The change of shape in Amoeba is due to the formation of pseudopodia, which are temporary projections that help in movement and feeding.