What creature do you think has best chances of surviving a global disaster ( like the one the dinosaurs)?

Bacteria will probably survive any global disaster. Otherwise, it depends on the event. If oxygen gets consumed, the animals die. If sunlight is blocked, plants will die. Land plants have an advantage because they have seeds that can sprout later. Of the animals, I would suspect some deep cave-dwelling animal would be least affected.

a extensive scale nuclear conflict could wipe out a great form of the Northern Hemisphere precise away, and any survivors could ought to attend to radioactive clouds, altered climate types, and a "nuclear wintry climate" brought about via the extremely a lot of smoke and dirt suspended interior the ambience for a number of years blockading out maximum of the sunlight. a extensive meteor result ought to at present devastate a extensive area, yet in addition throw up a extensive quantity of dirt and smoke into the ambience, having the comparable consequences as a nuclear wintry climate. a extensive volcanic eruption ought to reason a matching yet smaller result. a substantial pandemic, like the flu in 1915-sixteen, ought to disrupt farming and transportation over maximum of the globe, inflicting great famines. In all of those eventualities, having a extensive grant of nicely preserved nutrition could make a great distinction, in case you survived the preliminary disaster.

Cockroaches definitely!

Alligators and crocodiles. They have survived them before.

Small, simple, spore forming, robust algae.