2 eroding of land by wind
4 overusing land
3 plowing land without replanting
Pavlov's dog stopped salivating to the bell when the food was no longer paired with the bell. This is called:
extinction
Answer is combination
cccc::::
Answer:
cholesterol.
Explanation
Options a, d, c, and e all contains amino acids units. They are therefore made up of protein structure. cholesterol contains alcohol and steroids. it belongs to the steroid lipid family unlike other options that belong to protein family.
