Federal vs. Unitary Governments. In a unitary government the power is held by one central authority but in a federal government, the power is divided between national (federal) government and local (state) governments. In recent years there has been a strong global trend toward federal governments.
Different types of autotrophic nutrition. Autotrophic nutrition is very important! Autotrophic nutrition means that simple inorganic substances are taken in and used to synthesise organic molecules. Energy is needed to achieve this. In photo-autotrophic nutrition light is the energy source. In most instances the light source is solar energy, the process being photosynthesis. Carbon dioxide and water are taken in by organisms and used to synthesise glucose, which can be broken down later during respiration to release the energy needed for life.
Autotrophs are self feeders that use light or chemical energy to make food. Plants are an example of autotrophs. In contrast, heterotrophs (other feeders) obtain energy from other autotrophs or heterotrophs. Many bacteria and animals are heterotrophs.