The diagrams below show part of the breathing apparatus of a human. Which row of the table correctly identifies the locations affected by two chemicals found in cigarettes and by…

The design in the diagram is formed from four circles which all touch at the top of the shape (the diagram is not to scale).The diameter of the smallest circle…

Nuclide XNR is an unstable isotope which decays in two stages into nuclide Z as shown:What are the values of P and Q? Answer: 3) B When an atom decays…

2.74g of 1-bromobutane is reacted with excess aqueous sodium hydroxide to produce 1.11g of butan-1-ol according to the equation below.C4H9Br + NaHO → C4 H9OH + NaBrWhat is the percentage…

Which of the following could result in a homeostatic response?1 A rise in an internal condition.2 A reduction in an internal condition.3 A rise in an external condition.4 A reduction…