Educational psychology is a lifespan discipline. It examines how learning occurs from infancy through childhood, adolescence, and into later life. By studying cognitive and behavioral changes across all stages, psychologists can develop strategies that support lifelong learning and adaptation, recognizing that the capacity for growth and knowledge acquisition continues well beyond formal schooling years.

The 'critical period' hypothesis suggests that there is a window of time during childhood when the brain is particularly plastic and receptive to language acquisition. During this phase, children can learn the complex grammatical rules of a second language more naturally and effectively than adults.

Development is a lifelong, continuous process that follows an organized, predictable sequence of stages. It is also considered a creative process because individuals actively adapt to their environments, constructing their own understanding of the world and developing unique personality traits through their interactions with the world around them.

Teratogens are external agents, such as chemicals, viruses, or drugs, that cause birth defects. Options A, B, and C refer to genetic or metabolic conditions, whereas the 'fetus' is the developing organism itself, not an agent of harm. This question appears to be phrased in a way that identifies the subject rather than the agent.

While development involves observable changes, it is fundamentally defined by internal, qualitative, and structural transformations that are not always directly visible. Development is considered complex, integrated, and continuous, but limiting it to 'observable changes' ignores the significant cognitive and emotional maturation that occurs internally throughout the lifespan.

Human development is a lifelong, multidimensional process that begins at the moment of conception and persists throughout the entire lifespan. It encompasses physical, cognitive, and psychosocial changes that occur from infancy through childhood, adolescence, adulthood, and finally into old age, concluding only at the end of life.

While feelings and emotions are central to human psychology, the biological process of reproduction is a fundamental aspect of human experience from an evolutionary and developmental perspective. It is essential for the continuation of the species and is deeply intertwined with biological drives, social structures, and psychological development across the lifespan. Note: This answer reflects a biological focus on human experience.

The term 'congenital' refers to any condition, trait, or anomaly that is present at the time of birth. It does not necessarily imply that the condition is inherited or genetic; it simply denotes that the characteristic existed in the individual from the moment of birth, regardless of whether it was caused by environmental factors, developmental issues, or genetic inheritance.

Contrary to older beliefs, newborns possess functional sensory systems. They are capable of visual tracking, meaning they can follow slow-moving objects with their eyes shortly after birth. While their vision is not as sharp as an adult's, they show a preference for faces and high-contrast patterns, which facilitates early social interaction and learning about their environment.

Lawrence Kohlberg proposed a stage theory of moral development consisting of three primary levels: the preconventional level, the conventional level, and the postconventional level. Each of these levels is further subdivided into two stages, totaling six stages of moral reasoning across the three levels.