Costa rica y panamá comparten una selva que hasta hoy no se ha explorado.

true
false

false

Explanation: The sentence says:

"Costa Rica and Panama share a  

jungle that to the day has not been explored"

It is true that Panama And Costa Rica share a big tropical jungle, but is false that it has not been explored (while this jungle has some dense and dangerous parts, it has been explored to an extent), so the sentence is false.

when the outside temperature is too cold, an endothermic animal can generate heat by shivering. endothermic animals must eat much more often than ectothermic animals since it takes energy to maintain a constant body temperature.