Answer:
D) Room temperature
Explanation:
For the experiment to work and have good reliable results there should only be one variable. In this case, the variable is the noise level, and the different room temperatures would influence the experiment's results.
Answer:
At different times
Explanation:
The echo returns at different times, but faster in water. This is because water particles are bound closer and this makes them transmit vibration energy from one particle to the next quickly. An echo is a sound wave and sound waves are longitudinal waves that occur by the collision of particles to move the vibrations along, and this is why they move slower in air.
Answer: true
had to put something here
Answer:
<u>Character</u><u>istics</u><u> </u><u>of</u><u> </u><u>present</u><u> </u><u>society</u><u> </u><u>are</u><u>:</u>
- There is active participation of people in development activities in the society.
- The people living in a society have mutual understanding and relationship between them.
- There is a feeling of unity among the members of society.
- The members of society work together and help each other to fulfill their basic needs.
- The members of society share common goals and objectives.
- There are certain norms, values and culture to govern the social life.
- The main objective of society is to develop in all its spheres.
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