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This picture represents an ecosystem or the reactions between living and non-living components in a specific area.

We can see a variety of living and non-living things. There are plants and animals, soil and water, air and light energy from the Sun.

Although they are too small to see with the nàked eye, there could be a range of microorganisms, such as bacteria, algae, fungi, protozoa, or even viruses.

The river and its banks are examples of a habitat, which is a place where an organism can live or grow. The deer, the racoon, the dragon fly and the eagle are examples of individuals, or single living thing. All the organisms of the same species, in the same place,at the same time represent a population. Some examples are the cattails, the fern, the ladybug and the turtles. These individuals organisms, of the same species, interact with each other to form a community.

b brown mice / white sand dunes

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.