Suppose you scraped off some of the pale green stuff from the tree bark. How would you know whether it was alive or
not? What observations would you note? What tests could you do to see
whether it's alive?

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

answer; /// the shaft of the hair consists of dead cells;