The answer is b)produces sugars
Circulatory -
Brings oxygen and nutrients where it is needed, removes toxic chemicals, maintains a stable body temperature
Digestive -
Food and nutrients are absorbed in the small intestine. These nutrients are necessary for other body systems to maintain homeostasis.
Excretory -
Removes all waste from the body, kidneys filter chemicals, liver filters toxins
The correct answer is (b) <span>They can be directly observed.</span>
The answer is B. Light microscope
Two five dollar bills = ten dollars
10+10+10+10=40+286=326
