1) sugar is classified into which nutritional group?

2) for a unicellular organism to live, what must it do?

3) give an example of an organism that can cause a contagious disease.

1:  carbohydrates.

2: Most often they eat other organisms, the some kind of them such as plants or protist can make their own food.

3: Fungi and worms can cause some diseases under certain conditions.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.