Models are three-dimensional teaching aids that represent real objects or systems in a scaled or simplified form. They allow learners to observe shape, structure and spatial relationships that might be difficult to grasp from pictures alone. Examples include anatomical models, globes and molecular structures. Therefore, the three-dimensional replicas mentioned in the stem are correctly identified as models.
Option A:
Charts are two-dimensional visual aids that present information through diagrams, graphs or tables. While useful, they do not provide the three-dimensional realism emphasised in the stem.
Option B:
Models can be manipulated, observed from different angles and used for demonstrations, making learning more concrete and engaging. Because the stem clearly points to three-dimensional replicas like a globe or heart replica, models is the accurate term.
Option C:
Flashcards are small cards with information or images used for quick drills or review. They are flat and not three-dimensional replicas.
Option D:
Slides are projected images shown on a screen; they are part of visual or audio-visual aids but lack the tactile three-dimensional quality described in the question.
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