What characteristics of a living things can be applied to an automatic door

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.

As an asteroid comes close to earth, it's name will change to? apex