biology

• non-communicable disease: a disease that cannot be passed from one person to another
• body mass index (BMI) is a measure of body fat based on height and weight
• Transmission of infections from person to person​: Direct contact, airborne, waterborne, and vector-borne
• How to use a microscope to calculate the length of a cell: Use the magnification to calculate the size of the image. Use the size of the image to calculate the length of the cell.
• what are two non- communicable dieases?

  cancer, diabetes
• The heart and double circulatory system are the two main organs of the circulatory system.
• Pacemaker cells are found in the right atrium and generate a regular heartbeat
• veins and arteries: veins carry blood back to the heart arteries carry blood away from the heart
• Calculating a range of values: Average = (total / n) x 100
• structure of plant leaf

  
• structure of xylem

  
• How stomata open and close? - Open when light intensity is high, close when light intensity is low
• Photosynthesis: the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product
• Enzymes and digestion: Enzymes are proteins that speed up chemical reactions in the body.
• Effect of pH on enzymes: Enzymes are denatured at pH below 7.
• Antibiotic Resistance: The ability of bacteria to resist the effects of antibiotics.
• Identifying variables: The variables that are being measured in the experiment.
• stem cell

  
• Active transport, osmosis and diffusion are all examples of passive transport.