act or process bringing change. Acts of making or becoming something else. To go from one train, bus, etc. and go to another.

biological community of interacting organisms and their physical environment. Types of plants and animals in an specific area.

natural colouring matter of animal or plant tissue. Substance that makes things have a certain color. colour something with or as if with pigment.

control or maintain rate or speed of machine or process so that it operates properly.

system of parts in machine. System or process for achieving a certain result.

To become or cause to become less in size, value.

sentence worded or expressed so as to elicit information. Issues or problems you are dealing with. ask someone questions.

find unexpectedly or while searching.

Concerning things that can be seen or touched. Health check at the doctors' or hospital.

Set of changes that occur slowly and naturally. To adopt a set of actions that produce a result.

normal. what is commonplace or standard.

Predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton.