menstrual cycle calculator : How it works? in the second column , in each row you enter the first day in which you have your period , then it will calculate Cycle Length (in days) Ovulation Date THE NEXT ESTIMATED PERIOD DATE Fertility Window Start Fertility Window End also you’ll get a visualization about your cycle length to see if it’s organized or not for the second sheet you have four phase of the menstrual cycle in each phase you’ll pick the symptoms that you feel during the cycle

This GCSE KS3 Biology lesson on Birth and Labour is a clear, exam-focused, and student-friendly resource designed to help learners understand human reproduction, the stages of birth, and common complications during labour. What’s Included: GCSE KS3-aligned lesson content Clear explanations of pregnancy and gestation The three stages of labour (exam essential) Processes involved in birth (contractions, hormones) What can go wrong + medical solutions

Structure of DNA poster ks3 Clear and engaging explanation of DNA structure and function with easy-to-understand visuals and examples — perfect for biology lessons, revision, and exam prep

Nervous System & Brain Anatomy Biology Notes | High School Science, GCSE & AP Biology Engage your students with these comprehensive Biology Notes on the Nervous System and Anatomy of the Brain. Designed for high school science, GCSE Biology, and AP Biology, these notes break down complex concepts into clear, student-friendly explanations that are perfect for classroom instruction, revision, or independent study. This resource covers: Structure and function of the nervous system Detailed anatomy of the brain (lobes, cerebellum, brainstem, diencephalon) Key functions: movement, memory, senses, coordination, and regulation Easy-to-follow diagrams and labeled sections for visual learners Teacher-ready notes for lectures, handouts, or study guides Why teachers love it: No prep → Just print and go! Aligned to standards → Supports Next Generation Science Standards (NGSS), AP Biology curriculum, and GCSE Biology specifications Ideal for biology lessons, exam preparation, homework assignments, and review activities