Setup
install.packages(c('dplyr', 'readr', 'tidyr'))
download.file("https://ndownloader.figshare.com/files/2292172",
"surveys.csv")
download.file("https://ndownloader.figshare.com/files/3299474",
"plots.csv")
download.file("https://ndownloader.figshare.com/files/3299483",
"species.csv")
download.file("https://www.datacarpentry.org/semester-biology/data/shrub-volume-data.csv",
"shrub-volume-data.csv")