Vitamin K is essential for blood clotting; its deficiency causes excessive bleeding, unlike Vitamin C (scurvy) or B (various deficiencies), per medical references (e.g., Merck Manual).

Cytology studies cell structure and function, distinct from physiology (body functions) and anatomy (body structures), per biology texts (e.g., Campbell Biology).

Solar energy includes visible light, infrared, and ultraviolet, all forms of electromagnetic waves, as per solar physics (e.g., NASA solar studies).

Gamma radiation is highly penetrating and energetic, causing significant cellular damage, unlike alpha (stopped by paper) or beta (stopped by skin), per radiation safety sources

Radio waves have the longest wavelengths (up to kilometers) in the electromagnetic spectrum, per physics texts (e.g., “University Physics” by Young & Freedman).

Nitrogen comprises ~78% of Earth’s atmosphere, compared to oxygen (~21%) and carbon dioxide (~0.04%), per atmospheric chemistry data (e.g., NOAA).

A microphone converts mechanical sound waves into an electrical audio signal, as confirmed by audio engineering references (e.g., “Fundamentals of Audio Engineering”).

A step-up transformer increases voltage by having more turns in the secondary coil than the primary, as per transformer principles in standard physics texts (e.g., Halliday & Resnick).

Leap years occur every 4 years on years divisible by 4 (e.g., 2020, 2024, 2028).

Mercury is closest to the Sun and has the fastest average orbital speed (approx. 47.87 km/s).