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It studies the body’s functional characteristics, systems, organs, and tissues at different ages. The life cycle of all animals and man consists of certain stages or periods. For example, mammalian development goes through the following periods: intrauterine (including the phases of embryonal and placental development), first hours after birth, lactation, puberty, maturity, and senescence. Aggression – angry or threatening behavior or feelings that often result in fighting. E.g.: Television violence can encourage aggression in children. Aggressive – behaving in an angry, threatening way, as if you want to fight or attack someone. E.g.: Teachers apparently expect a certain amount of aggressive behavior form boys. Allegation – an accusation of physical, emotional or sexual abuse, or serious neglect, of a child or young person by a foster carer or other member of the foster family. Allowance – this is a payment given to foster carers to cover the cost of the child's care including food, clothing, transport and pocket money. Altruism – the selfless concern for the welfare of others; when you care about or help other people, even though this brings no advantage to yourself. Altruistic – behavior shows that you care about and will help other people even though this brings no advantage to yourself. Ambidexterity – ability equally successfully to use both right, and the left hand. Ambition – is the desire for personal achievements. Ambivalent – not sure whether you want or like something or not. E.g.: We are both somewhat ambivalent about having a child. Ambivalent feeling – the difficult condition of the personality connected with simultaneous emergence of opposite emotions and feelings; manifestation of the internal conflict of the personality. It is often observed at teenagers in interaction with contemporaries, parents, teachers. Ambiversion – is a term used to describe people who fall more or less directly inthe middle and exhibit tendencies of both groupsof extraversion10