In some forests and parks containing varieties of flowering trees and shrubs, there are signs that read, "Take nothing but pictures; leave nothing but footprints." These signs help people to remember that
a
the removal of flowering trees and shrubs will increase biodiversity.
b
humans can disrupt habitats by removing flowering trees and shrubs.
c
all animals feed directly on flowering shrubs that may be removed by people.
d
flowering shrubs grow better in state forests and parks than in other locations.
b
humans can disrupt habitats by removing flowering trees and shrubs.