Human Growth and Development

49.​ C: Children with this condition may show a range of symptoms, some of which can appear as early as 6 to 18 months of age. These include: ●​ Difficulties with social skills, like making poor eye contact ●​ Challenges in understanding others' emotions ●​ Tendency to avoid social interactions ●​ Behavioral issues, such as repetitive movements (e.g., hand flapping), strict adherence to routines, and engaging in pica (the consumption of non-food items like clay, chalk, or dirt) ●​ Language difficulties, such as delayed speech development, speaking in a sing-song manner, and repeating words These are general patterns observed in some children, but individual experiences and presentations may vary based on specific circumstances. 50.​ B: Alzheimer's disease is associated with two main features: plaques (clumps of beta-amyloid protein around brain cells) and tangles (twisted tau protein threads inside brain cells), both of which interfere with nerve signaling and contribute to cell death and cognitive decline .

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