Questions with the keyword 'excretion'

• why is poo brown by 12fabenaichouche to Becky Comments: (No comments so far )
• Which evolved first: the mouth, the stomach, the digestive fluids, or the ability to excrete? by n3rdy to Gopal, Hannah, Becky Comments: (No comments so far )
• Why is faeces brown? by blackie and 1 other. to Angela, Gopal, Hannah, Becky, Vince Comments: (So far, one comment )