Three students were asked to estimate the population size of a wildflower species in a meadow by using a quadrat. The diagram shows where each student placed their quadrats in the meadow: 
Which student would obtain the most reliable estimate? Give reasons for your answer.
State what is meant by the term community.
Five other students investigated the distribution of a seaweed species (bladderwrack) along a rocky shore. They placed a small quadrat (10 cm by 10 cm, divided into 100 squares of 1 cm by 1 cm) at the high tide line (0 m) and then at 2-metre intervals along a straight transect line down to the low tide line. The percentage cover was recorded based on how many of the 100 squares contained the seaweed. The table shows the results obtained: \begin{array}{|c|c|c|c|c|c|} \hline Student\textbf{Student}Student & 0 m\mathbf{0\text{ m}}0 m & 2 m\mathbf{2\text{ m}}2 m & 4 m\mathbf{4\text{ m}}4 m & 6 m\mathbf{6\text{ m}}6 m & 8 m\mathbf{8\text{ m}}8 m \ \hline P\text{P}P & 5 & 22 & 45 & 70 & 92 \ \hline Q\text{Q}Q & 8 & 18 & 52 & 68 & 95 \ \hline R\text{R}R & 6 & 25 & 48 & 75 & 90 \ \hline S\text{S}S & 4 & 21 & 8 & 72 & 88 \ \hline T\text{T}T & 7 & 24 & 51 & 70 & 95 \ \hline average\textbf{average}average & 6 & 22 & 49 & 71 & 92 \ \hline \end{array} One of the averages has been calculated by ignoring an anomalous result. Which student obtained the anomalous result?
The diagram below shows the quadrat used by one of the students at 2 m: 
Which student obtained the results shown in this quadrat?