Answer: hello the options related to your question is missing
answer : space probe ( option 1 )
Explanation:
The unpiloted spacecraft designed to gather information while orbiting planets is Space probe
Space probe is a spacecraft that practically gathers ( scientific ) data from the planets which it sends back to scientists on earth for study. A space probe is unlike other spacecrafts because they do not require the presence of an astronaut.
Gas is the answer. I hope its the right one but its the best thing i could come up with
It means an organism respire without it
so that organism know as anaerobic
for example : bacteria eats human and animal dead bodies under the earth there O² is deficient so bacteria respire with oxygen O²
The Green Revolution provided B. An increase in the yield of crops forless-developed countries.