What is the oldest form of biotechnology

A. selective breeding

Explanation:

The unit spoke of this first, referencing it's use for centuries. Then later introduced an example of selective breeding used later called hybridization. And it graded correctly

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

mountains can affect the climate of nearby lands. in some areas, mountains block rain, so that one side of a mountain range may be rainy and the other side may be a desert. much of airborne moisture falls as rain on the windward side of mountains.

explanation: