The application of measures to promote public health and prevent the spread of infectious diseases

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

c. is the correct answer

a = executive branch; b = judicial branch