Why Are Search Strategies for Extraterrestrial Life Usually Based on a Carbon

question 2

Multiple Choice

Why are search strategies for extraterrestrial life usually based on a carbon chemistry?

• A) Carbon dioxide is the main ingredient of planetary atmospheres,both terrestrial and Jovian.
• B) Carbon is abundant and is versatile in forming complex,long-chain molecules.
• C) Most meteorites that reach Earth are composed of carbon.
• D) No other atom can combine easily with the abundant hydrogen and helium to form long molecules in interstellar gas.

Understand the functionality and safe operation of input and output statuses in PLC systems.

Identify and describe the roles of specific PLC instructions like JMP, JSR, MCR, and their impact on program flow.

Understand the implications of hardware changes (like stop button modifications) on PLC program logic and operations.

Recognize the importance of emergency stop circuits and safe practices in PLC programming and hardware maintenance.

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