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Design a controlled invertebrate heart-rate comparison
Standardise a fixed DCPIP endpoint using a vitamin C reference
Design a named-variable permeability investigation
Select variables and suitable controls
Explain preparation and optical-microscope use
Prepare and orient a suitable stem section
Design a controlled mineral-deficiency comparison
Control fibre preparation and loading conditions
Prepare a controlled plant-extract comparison
Choose quadrat or transect sampling suited to the question
Design a named-factor investigation
Design a controlled enzyme-temperature investigation
Define a measurable developmental outcome
Explain charge-driven DNA separation through a gel
Design a defined antibiotic–organism comparison
Design a controlled culture comparison
Determine tidal volume and breathing frequency from suitable traces
Design a controlled repeated-stimulus investigation
Work through each topic to complete the section.