The atrioventricular valves.
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.
Answer:
digestion
i think this is the answer
Answer:
the difference is that permanent gases have larger residence times and Variable gases have shorter residence times