The true statement among the following options is c. As the substances which we use are compounds.
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.
Compounds include things we use in our everyday lives.Compounds are substances composed of two or more different elements chemically combined in a fixed ratio by weight. They are everywhere in our daily life, from food to electronics. For example, table salt is a compound that we use to enhance the flavor of our food.
Thus, the correct option is C.
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Decomposers
Primary consumers
Secondary producers
Answer: Primary producers
A food chain is a linear series of transfer of food and energy when one organism is consumed by the other organism in an ecosystem. The energy is distributed among different tropic levels of the food chains.
Phytoplankton is a class of unicellular simple, autotrophic organisms which are found in water of ocean, lakes and or any other freshwater body. These includes dinoflagellates, diatoms, cynobacteria, green algae and others. These organisms are abundantly present in the ecosystem in the lower most trophic level. They are called as primary producers because they are consumed by other organisms such as zooplanktons, fishes and large sea mammals.
b. Neolithic era
c. Bronze Age
d. Iron Age