The diagram show the male and female human reproductive systems.

The diagram shows the life cycle of a flowering plant.

The water cycle on Earth can take place continuously because water_________.

A) Melts at 0°C and boils at 100°C
B) Can change from one state to another
C) Has volume and cannot be compressed
D) Is important for the survival of living things

Two identical pieces of paper, one crumpled into a ball, are released from the same height at the same time as shown.

The diagram shows three cells X, Y and Z.

Moth caterpillars feed on the leaves of trees, causing the trees to die over time. Some ways of getting rid of the moth caterpillar are spraying eco-friendly pesticides and cutting or burning down of the affected trees.
Based on the information provided, which of the following outcomes are likely to result over time?
 
      A    Loss of habitats
      B   Depletion of ozone layer
      C   Loss of aquatic life in the nearby rivers

Irene released a wooden block from the top of a ramp as shown. The wooden block slid down the ramp and moved along the floor stopping at point S.

Which of the following statement are true about the wooden block?

A) The wooden block has the most potential energy at P.
B)  The wooden block only had kinetic energy at Q and R.
C)  The wooden block has more potential energy at R than at Q.
D) If lubricant is applied on the floor, the wooden block would slide beyond S.