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

The water authority charges $20.00 per month for the meter rent, $2.00 for the first 1 000 litres and $0.20 for each additional 100 litres. What is the total bill for 2400 litres used in one month?

At 20 ℃ all of the halogens are:

When aluminium is extracted by electrolysis, cryolite is added to:

All gas exchange surfaces in vertebrate animals have:

The optimum temperature for enzyme action is:

All of the following are systems programs EXCEPT __________

In a partnership maintaining fixed capital accounts, the net profit is appropriated to the

Most plant and animal cells contain:

To make fertilisers and explosives we need:

Food can be preserved in all of these ways EXCEPT for:

In a box, there are 3 white, 4 red and 2 blue marbles. What is the probability that a marble taken at random is NOT blue?

The main taxonomic groups in order, starting with the largest, are:

All of these are carbohydrates EXCEPT for:

All of the following processes result in energy loss from an ecosystem EXCEPT for:

The site of reabsorption of MOST of the water from the filtrate.

If U = {1, 2, 3, . . . 10 } and S = { 4, 5, 6, 7, 8 }, then S ' =

Instructions: Select the option A, B, C or D that BEST describe the sentence.

Seldom do people declare that they are not the products of their environment.

Acid soils can be neutralised by adding:

__________ is a type of chip from which data can be erased by exposure to ultraviolet light.