The answer is A. <span>effective length of the tube
In wind instrument, the effective length is not the actual length of the instrument but only the length that the finger holes manage to cover.
The more holes it managed to cover, the higher frequency of vibration it might able to produce, which lead to higher pitch of the instrument.</span>
<em>The botulinum toxin, a poison produced by the bacterium Clostridium botulinum (C. botulinum), is common in soil and exists in untreated water. It can survive in these environments as a resistant spore. Foodborne botulism is caused by consuming foods containing the botulinum toxin.</em>
Answer:
false
Explanation:
Fire extinguishers, emergency showers and eye wash stations are basic safety elements that must be present in all laboratories, regardless of their classification. This is because these are essential elements for common accidents in laboratories and can be easily solved with their presence.
The correct answer is - That some force lifted the rocks from the water.
The fact that there's sedimentary rocks on the tops of the mountains is an evidence that there has been some force that managed to lift upwards parts of the seafloor. Taking into consideration how slowly this force manages to lift up parts of the Earth, we can easily assume that the Earth is very old. The amount of time that is needed for a part of the seafloor to be lifted few thousand meters upwards is counted in tens of millions of years, thus giving us evidence that the Earth has been around for a very long time.
