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...account for planets orbiting stars other than the Sun. These planets are called exoplanets. The first planet orbiting another Sun-like star was discovered in 1995, and since then astronomers have found over 4000 of these exoplanets. A star along with its exoplanets is known as a planetary system. We now know that our own Solar System is not unique: it is one planetary...

...account when interpreting samples. Orientation Most histological sections are 2D slices, from a 3D piece of tissue. Exactly what will be seen on the microscope slide depends on the plane of the section; that is, the position of the microtome cut, in relation to the anatomical structures in the tissue. Clinicians attempt to cut tissues in a plane that allows the underlying...

...account for the differences in hardness between the two minerals? Diamond has a three-dimensional bonding pattern, with identical bonding in all directions, and no 'weak' directions. Graphite has a mainly two-dimensional pattern, with sheets of C-C bonds. Bonds between the sheets are very weak, so sheets can easily slide past each other, explaining graphite's use as a...

...accounted for over 80% of the UK’s oil consumption and 40% of the UK’s final energy use. Liquid fuels produced from oil made up 97% of the final transport energy demand. Electricity made up less than 1%. [Described image] Figure 1: UK primary and final energy use, 2018 The UK produces oil but its oil reserves have been falling. Peak UK oil production was in 1999 and...

...accounts for about 21% of the Earth’s atmosphere so the partial pressure of O2 (PO2) in the atmosphere is 0.21 × 760 mmHg = 160 mmHg. CO2 is present only in trace amounts, so the partial pressure of CO2 (PCO2) in the atmosphere is roughly 0.3 mmHg. Question 4 Nitrogen Nitrogen (N2) comprises 78% of the Earth’s atmosphere. What is the partial pressure of nitrogen...

...account, explain how natural selection could have caused an increase in beak size in this population of ground finches. The adult survivors of the drought were the ones with the largest beaks because they could still crack large seeds. These birds then mated and because beak size is heritable and is passed on to offspring, the chicks from these birds inherited large beak...