In science, it is important to be able to distinguish between an experiment and other scientific investigations. Which of the following is the best example of an experiment? a, measuring the frequency of the fire alarm at your school

b, measuring the wavelengths of various sources of blue light

c, measuring the wavelengths of x-rays and gamma rays from Barnard's Star

d, measuring the change of frequency of a car horn every five meters as the car drives away

Uranium-238 decays very slowly, with a half-life of 4.47 billion years. what percentage of a example of uranium-238 would remain after 13.4 billion years

The arrival of the conquistadors affected every indigenous people group they encountered. in this activity, you will write letters from the point of view of an incan and a conquistador. research the topic on the internet or at the library before writing. each letter should contain at least two paragraphs and be at least eight sentences long. 1) you are an inca and the conquistadors have arrived in your village! write a letter to be sent to other incan villages. describe your thoughts about the conquistadors and how their arrival might change your life. 2) write a letter from the point of view of a conquistador meeting the incas for the first time. address the letter to your family back in spain.me! i would really appreciate it! my dog died this morning and we are trying to fill out a form for her. it would amazing if you could me on this.

Abrief, "first-step" presentation of a work to be completed is called a