Answer:
Different things make different vibrations when they hit, and that's why you hear high notes and low notes. Things that vibrate quickly make small waves in the air, and that sounds to you like a high-pitched note. Things that vibrate slowly make longer waves in the air, that sound to you like a low-pitched note.
B. Vitamin B12 and C only. If you just add them up through each column and compare what he is supposed to have to what he gets in the meal then you will see he only meets his recommend B12 for the day and at least 75% of Vitamin C.
D. Mitosis and Cytokinesis
The answer would be C. Energy is used through the food chain so energy always decreases. Population size would commonly decrease according to the pyramid of food chain but since there's no answer for that, C would be the most suitable
