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This online resource investigates the internal structure, outer layers and surface features of the sun.

The phases of Meiosis.

Explanation of the phases of mitosis

This online resource explores the terrestrial, or inner, planets - the planets closest to the sun: Mercury, Venus, Earth and Mars.

Micturition (peeing) starts with urine flowing from the kidneys to the bladder via ureters. The bladder expands using transitional epithelium. Urine exits through the urethra, controlled by internal and external urethral sphincters. Ureters prevent backflow, thereby reducing infection risk

Details on the light-dependent reactions of photosynthesis

Overview of photosythesis

C-4 Photosynthesis: How some plants avoid photorespiration

Introduction to evolution, variation in a population and natural selection

Introduction to viruses