There Is an Article in Your Local Newspaper About an Upcoming

There is an article in your local newspaper about an upcoming "Biodiversity Day" event at your university. Because you understand why it's important to conserve biodiversity after studying biology, you plan to attend. Your younger brother tells you he doesn't understand how the loss of a few species or habitats in town can have any impact on anyone's life. You could tell him

A) a decrease in biodiversity could result in a loss of species that could provide humans with new drugs to cure disease.
B) directly or indirectly, every species on Earth is necessary for human existence.
C) humans are not part of the web of life, but we must respect it.
D) the loss of even one species will cause the collapse of important systems that humans rely on.