Explain why sustainability is crucial for human survival ?

Everything that we need for our survival and well-being depends, either directly or indirectly, on our natural environment.

Explanation:

https://www.epa.gov/sustainability/learn-about-sustainability

c. taught scientists many new things about the earth, but not other planets.

explanation:

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.