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When environmental conditions change it is more likely that at least some members of a species will survive if there is variation among the members.
One hypothesis is that climate change from a massive asteroid impact led to a decrease in temperature and sunlight, disrupting the food chain and causing widespread extinction among plant and animal species, including the dinosaurs. This sudden change may have been too drastic for the dinosaurs to adapt to, leading to their eventual extinction.
In much the same ways as any animal family: gradual physiological changes to better withstand the conditions or use the available food. The KT-Boundary mass-extinction (about 63Ma) that did for most of them was brought about by an environmental change too major and too rapid for the reptiles to survive.
there is variation among the members.
It depends on the specific organism and the environmental change. Some organisms may adapt, migrate, or go extinct if they cannot survive the change.
As I was told, dinosaurs were around before the Flood. Afterward, they were unable to survive, due to change in environment and atmosphere.
It wasn't that big! The theory is that a large meteor hit the Earth and the explosion caused a large amount of dust in the upper atmosphere which caused climate change and the dinosaurs (or most of them) didn't survive.
Non-avian dinosaurs existed from around 230 million years ago in the Triassic period until the end of the Cretaceous period, 65 million years ago. The cause of their extinction is most likely an asteroid impact coupled with environmental change.
Dinosaurs were a very successful type of organism who lived on Earth for many millions of years before something, probably a giant asteroid collision, wiped them out. Perhaps, in retrospect, being so extremely large made them vulnerable to certain types of environmental change, when smaller species proved to be more adaptable. Bigger is not always better. Notably, smaller species of feathered dinosaur did survive, and still exist today.
a greater chance to survive if the environmental conditions suddenly change.
We no longer have dinosaurs
When environmental conditions change, organisms may need to adapt to survive. This can involve changes in behavior, physiology, or genetic makeup. If an organism is unable to adapt to the new conditions, it may face increased risks such as decreased survival or reproduction.