Question

Define: Isthmus, Biosphere​

Answer 1

$\huge\mathbb\fcolorbox{white}{cyan}{Isthmus}$

a narrow piece of land, with water on each side, that joins two larger pieces of land

$\huge\mathbb\fcolorbox{white}{cyan}{Biosphere}$

the part of the earth’s surface and atmosphere in which plants and animals can live