Which sequence of terms is in the correct order from simplest to most complex?

Which sequence shows a decreasing level of complexity?

The respiratory system includes a layer of cells in the air passages that clean the air before it gets to the lungs. This layer of cells is best classified as

Some levels of organization in a multicellular organism are shown in the sequence: A - cells - tissues - B - organ system - organism Which terms represent letters A and B?

During a long-distance run on a hot day, an athlete produces large quantities of sweat. As a result, the kidneys change the rate of urine production. Why is this change important?

The main function of the human digestive system is to

Which two systems are most directly involved in providing molecules needed for synthesis of fats in human cells?

Which two organ systems provide materials required for the human body to produce ATP?

An increase in heart rate will most likely result in

To increase chances for a successful organ transplant, the person receiving the organ should be given special medications. The purpose of these medications is to

Which organ system in humans is most directly involved in the transport of oxygen?

Which body system is correctly paired with its function?

Which system is correctly paired with its function?

Which molecule can diffuse from the digestive tract into the human bloodstream without first being digested?

The nucleus of a cell coordinates processes and activities that take place in the cell. Which two systems perform a similar function in the human body?

The cytoplasm in a cell carries out a function similar to a function of which human system?

Which phrase does not describe a way the human body responds to fight disease?

What will most likely happen to wastes containing nitrogen produced as a result of the breakdown of amino acids within liver cells of a mammal?

Nerve cells are essential to an animal because they directly provide

Hormones and secretions of the nervous system are chemical messengers that

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