Which of these is an example of how engineers have contributed to society?
) a. the seven-mile bridge that spans across the gulf of mexico to
connect two cities of the florida keys
o
b. our current understanding of viruses
o
c. nomadic tribes traveling in search of food to hunt and gather
d. the theoretical mathematics describing the orbits of planets
around the sun
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The answer is celsius 

Iam not going to tell you

It can be classified based on its

Electron equations of the given changes are as follow,a)                              cu      →      cu⁺²  + 2e⁻b)                              mg⁺²  +  2 e⁻      →      mgc)                              cl⁻    →      cl  +  1e⁻d)                              s  +  2 e⁻    →      s²⁻e)                                o²⁻      →      o  +  2 e⁻f)                              p  +  3 e⁻    →      p³⁻g)                              fe²⁺    →      fe³⁺  + 1 e⁻h)                              s²⁻    →      s⁴⁺  +  6 e⁻