Which of the following are examples of environmental variation in humans?
Ⅰ hair colour
Ⅱ height
Ⅲ intelligence
Ⅳ body mass

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

The metal used in food containers whose surface is protected by a strong oxide layer is:

Which of the following nutrients is/are digested in the stomach?

When we sweat, we lose heat because:

Leaves are thin and flat:

A flame test colour of red could indicate the presence of a compound of:

All of the following are systems programs EXCEPT __________

Hydrocarbons contain carbon and:

The simplest ratio of atoms in a compound is given by the:

All of these are properties of carbon monoxide EXCEPT for:

The expression a² + b² is equivalent to

0.045 × 10^-3 in scientific notation is

Choose the ONE underlined part A, B or C that is inappropriate. If the sentence is acceptable as it stands, choose D.

She was not feeling well at the beginning of the journey, and sitting at the front of the car made her feel worse.

A boy throws a cricket ball straight up in the air. At the very top of its flight:

Which of the following statements about diffusion is NOT true?

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:

The point where two neurones connect is called:

Which of the following are all deficiency diseases?