What are the space enemies or environmental hazards in the astronauts inspace surviving the extremes?

the lack of oxygen a crack in their helmet could result in immediate death limited tools and limited amount of astronauts would result in death aswell they only get one chance to fix something and one ship if one thing fails everything fails

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.