Humans and human activity are the biggest threat to humans.
Earth is the biggest.
Well of course it is
No, Earth is the third planet from the sun. The biggest planet in our solar system is Jupiter.
It is average, after the earth
Halley's Comet is not dangerous to Earth. It poses no threat to our planet and its orbit is well-studied, so we can predict its movements accurately. The last time it was visible from Earth was in 1986, and it is not expected to return until 2061.
Yes
Short term, mankind. Long term, the evolution of the Sun.
Jellyfish are eaten by squid. I believe that this is the biggest threat that they face.
the market economy was the single biggest threat
Churchill thought that Hitler was the biggest threat in WW2
Biggest threat is a landowner with a 22 rifle or 12ga shotgun.
you are
Itself
a lion.
what is the biggest threat to the power of plutonomy
Hackers
Fire.