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3.1 As both the acacia and the acacia-ant benefit from this relationship, provide a name for this relationship (symbiosis). (1)

  Question 2   Below is an extract from the Nature Public Health Emergency Collection. Two figures are also included. Read the extract, study the figures, and answer the questions that follow.   Right-click on the blue button below to open figures and extract in a new tab:  

Presbyopia or “old vision” resulting from the loss of lens elasticity can be tested by measuring the:

5.2 Study the periodic table below and answer the questions that follow.     Right-click on the blue button below to open the periodic table:      

The Rinne test is used to evaluate:

8.7 State two factors that should be kept constant in this investigation. (2)

EXTRA UPLOAD SPACE Use this space only if necessary. 

What is the cost of lighting a 500-watt outdoor light for 8 hours, if electricity costs 7.5¢ per kilowatt-hour?

6. Study the diagram below and answer the questions that follow.   Right-click on the button below to open the image in a new tab:

The Weber test is used to evaluate: