During the northern-hemisphere's summer, Arctic terns nest in the most northern parts of the globe, such as Iceland and Greenland, as well as in other parts of northern-Europe and Canada. The birds then migrate halfway around the globe to Antarctica, in the southernmost part of the world, in order to find food and to avoid the cold northern-hemisphere winter. The Arctic tern has the longest annual migration in the animal kingdom and can cover $90,000 \mathrm{km}$ in one single year. An Arctic tern can live for $30$years, completing its migration every year. The distance to the moon is $384,400 \mathrm{km}$. Calculate the distance that an Arctic tern can travel in its lifetime and express your answer in terms of the number of times that it might be able to travel to the Moon and back.

A peregrine falcon is the fastest bird in the world. When it dives, it can accelerate to about $40 \mathrm{m} {\mathrm{s}}^{-2}$. Express this speed in $\mathrm{km} {\mathrm{h}}^{-2}$.

A peregrine falcon is the fastest animal in the world. When it dives, it can accelerate to about $40 \mathrm{m} {\mathrm{s}}^{-2}$. The bird's acceleration is about $8 \mathrm{m} {\mathrm{s}}^{-2}$. Calculate the length of the time the bird needs to get to its top speed from rest. 

A peregrine falcon is the fastest animal in the world. When it dives, it can accelerate to about $40 \mathrm{m} {\mathrm{s}}^{-2}$.  A graph of the vertical speed against time for one bird dive is shown below. Calculate the distance, the bird falls through during its dive.

In snail racing, snails start at the centre of a circle and the first snail to reach outside the circle wins. Usually, the ground is made wet so that the snails will want to move across it. Some snail racers think that a sugary solution or diluted beer makes the snails travel faster.

A student decides to design an experiment to test these ideas. Formulate a hypothesis for this investigation.

In snail racing, snails start at the centre of a circle and the first snail to reach outside the circle wins. Usually, the ground is made wet so that the snails will want to move across it. Some snail racers think that a sugary solution or diluted beer makes the snails travel faster. What should the student's independent variable be?

In snail racing, snails start at the centre of a circle and the first snail to reach outside the circle wins. Usually, the ground is made wet so that the snails will want to move across it. Some snail racers think that a sugary solution or diluted beer makes the snails travel faster. A student decides to design an experiment to test these ideas. Explain what the dependent variable is. How might it be measured?

In snail racing, snails start at the centre of a circle and the first snail to reach outside the circle wins. Usually, the ground is made wet so that the snails will want to move across it. Some snail racers think that a sugary solution or diluted beer makes the snails travel faster. A student decides to design an experiment to test these ideas. Explain what kind of graph the student should use to present the data.