during a solar eclipse, the sun apears to go either fully or partially dark. Why can solar eclipses only be observed on certain parts of Earth? circle all that apply ​

the Moon is smaller than Earth. Only the people in the Umbra will see the sun go totally dark.

Explanation: N/A

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".