Question

astronauts must prepare for certain conditions in space, such as microgravity and higher levels of harmful energy from light rays, known as radiation.

(1) complete the sentences with the correct words.

(2) microgravity and higher levels of radiation are part of the astronauts in space. these conditions make living in space living on earth.

routines
surroundings
experiments

Explanation:

Microgravity and radiation are aspects of the environment astronauts are in, which is best described by "surroundings". "Routines" refer to regular activities and "experiments" are scientific tests, neither of which fit as well as "surroundings" here.

Answer:

surroundings