If the machine is working properly then that rules out 2, 3 and 4 as they are all technical problems and therefore it must be A there waves don't reflect of the stone properly and therefore no image is formed
Hope that helps
The correct answer for the given statement above would be option D. The statement that correctly answers whether the question of alien life on the moon is scientific is, the question is scientific because it is testable and verifiable. Testable and verifiable in a way that it is possible to conduct tests or experiments to prove whether the given claim is true or not. A scientific statement is based on objectivity. As long as it is not based on personal interests, values, community bias or personal perspectives, it is considered as a scientific statement.
1. Seismologist use seismographs to measure seismic waves.
2. Residents prepare for earthquakes by finding a safe place outdoors away from any large buildings, they also secure things within their homes. That includes storing breakable items in cabinets, bracing hanging light structures, etc.
Antlions experience competition when they are still larvae and looking for food or prey intake. It is called the shadow competition in where the pits are located in the upstream that can block the path of the prey thus the ones in the downstream will have less prey intake.