If your body needs more energy, hormones from the system signal the nervous system to make you feel hungry. A - Endocrine
B - Excretory
C - Digestive
D - Respiratory

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b and c would be the answers

answer; /// an alphabetical list of sources arranged according to a citation style and followed by a summary of the content;

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.