Iron-deficiency anemia can cause fatigue (tiredness), shortness of breath, chest pain, and other symptoms. Severe iron-deficiency anemia can lead to heart problems, infections, problems with growth and development in children, and other complications.
Semantics is the study of meaning. It is a wide subject within the general study of language. An understanding of semantics is essential to the study of language acquisition (how language users acquire a sense of meaning, as speakers and writers, listeners and readers) and of language change (how meanings alter over time).
Semantics considers the content of communication. Semantics is the study of the meaning of signs-the association between signs and behaviour. Semantics can be considered as the study of the link between symbols and their referents or concepts â particularly the way in which signs relate to human behavior.