To complete the reaction: acid + carbonate → salt + carbon dioxide + ?, we must add the word:

Which one of the following is NOT a reflex action?

Which one of the following foods contains the most energy per 100 g?

Breathing in fish involves which two processes?

Which of the following devices are MOST LIKELY to be used at an airport for border control activities?

A(n) __________ printer is suitable for printing multi-part forms because they easily print through many layers of paper.

All of the following items are widely used input devices EXCEPT the __________.

Photosynthesis is important because:

The interest rate on investments in a bank increased from 5 per cent per annum to 6 ¹/₂ per cent per annum. The difference in annual interest on a deposit of $4000 is

A square has the same area as a rectangle with sides of length 9 centimetres and 16 centimetres. What is the length of the square?

All of these elements form allotropes EXCEPT for:

When we are too hot, more blood flows through the capillaries near the surface of the skin. This helps us to cool down because the blood loses heat by:

A contractor completed five-ninths of a job before a second contractor completed an additional one-third. What fraction of the job is left undone?

A relationship between two organisms where one organism derives benefits from the relationship and the other organism derives no benefit, but is not harmed, is called:

You never find native magnesium because:

Genetic engineering involves:

A home computer system is equipped with a memory card reader, floppy disk drive, a DVD drive and an internal hard disk, The LEAST an MOST portable media that can be used with this computer are __________.

A loudspeaker emits a steady note.A girl sings a note which is of lower pitch but higher volume. The sound wave she is producing has:

The point where two neurones connect is called:

All of the following devices are commonly used non-impact printers EXCEPT __________.