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).
The simple subject is the noun or pronoun that the verb acts upon. The complete subject includes additional words that describe the simple subject. The compound subject describes a subject with two or more nouns or pronouns. Examples: women, the older women, she and the older women.