Name three substances excreted by the human body and two organs that perform excretory functions.

Here are the answers for Question 1 (a):

a) (i) Step 1: Name three substances excreted from the human body.
The human body excretes various waste substances. Three common ones are:

• Urea
• Carbon dioxide
• Excess water

a) (ii) Step 2: Name two organs that perform excretory functions.
Two organs in humans that perform excretory functions are:

• Kidneys (excrete urine containing urea, excess water, and salts)
• Lungs (excrete carbon dioxide and water vapor)