What year was the first Earth Day celebrated?

Which natural element makes up about 60% of the human body?

What is the average number of trees on Earth per person?

Which vitamin is produced naturally by our bodies when exposed to sunlight?

How many heartbeats does the average human heart beat per day?

Which ancient civilization was the first to create botanical gardens?

How many breaths does the average person take per day?

Which famous naturalist spent 5 years aboard the HMS Beagle?

What percentage of Earth's species live in rainforests?

How many times can a hummingbird flap its wings per second?

Which plant can live for over 5,000 years?

What percentage of their lives do cats spend sleeping?

How many species of bacteria live in the average human belly button?

What percentage of Earth's oxygen is produced by ocean phytoplankton?

How many times more sensitive is a dog's nose compared to a human's?

How many bones does the average adult human have?

What percentage of our DNA do humans share with chimpanzees?

What percentage of human genes affect brain development?

How many species go extinct every day?

What percentage of their waking hours do humans spend outdoors on average?