The anatomical structures and steps involved in flowering plant pollination and fertilization from anther to ovule.

The four human ABO blood types, illustrating the red blood cells, surface antigens, and corresponding plasma antibodies.

The rays, angles, and components involved when light reflects and refracts at the interface between two media.

Common surgical instruments including various forceps, scissors, clamps, and a scalpel.

The four fundamental classes of biological macromolecules with their characteristic structures.

The astronomical forces, ocean bulges, and celestial alignments that produce high, low, spring, and neap tides.

The three classical laws of motion formulated by Isaac Newton, demonstrating inertia, force and acceleration, and action-reaction pairs.

The main structural components and reference marks of a standard liquid-in-glass thermometer.

The concentric compositional and mechanical layers of the Earth from the inner core to the surface.

The structural components of the cell membrane according to the fluid mosaic model, including lipid bilayer components and membrane proteins.