Answer:

1. The planets can be divided into two groups. Mercury, Venus, Earth and Mars form the terrestrial planets. They are small and are composed of rock and metal, like the Earth

2. Begin by saying everything you have to say about the first subject you are discussing, then move on and make all the points you want to make about the second subject (and after that, the third, and so on, if you're comparing/contrasting more than two things

3. Similarity in energy (or power if different lengths): Square the two signals and sum each (and divide by signal length for power). (Since the signals were detrended, this should be signal variance.) Then subtract and take absolute value for a measure of signal variance similarity

Explanation:

#PA BRIANLY PO