During an investigation into muscle strength, a group of students planned to compare their bicep muscles. Each student planned to lift a variety of masses, until they found the largest mass that they could lift. The masses were 5, 10, 15, 20 and 25 kg. The students would then plot a graph of their results. a) Suggest how the students could improve the reliability of the investigation.

b) Suggest how the students could improve the accuracy of the investigation.

c) The teacher told the students that their investigation was too dangerous. Suggest why.

Explain why phospholipid molecules form a bilayer. (3 marks)

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water

Select all that apply. careful listening skills include: refraining from interrupting the speaker taking quality notes making an effort to understand maintaining eye contact with the speaker