What have you been observing the world with all of your life? senses specialized tools specialized equipment complex device

The biosphere of the earth is made up of what compound? organic or inorganic?

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!

What is happening when the water inside a kettle heats up and begins to boil