1. What is excretion?
2. What are nitrogenous wastes?
3. What are the three main types of nitrogenous wastes excreted by living organisms?
4.why are most ammonotelic organisms aquatic animals?
5.Why did ammonotelic excretion cease to be used after animals left aquatic habitats and started to live in terrestrial habitats?
6.With regards to toxicity and the need for dilution in water, how different are ureotelic and uricotelic excretions? What are some examples of animals that use these types of excretion?
7. What is the nitrogenous waste produced by amphibian larvae and by the adult animal?
8.Why is uricotelic excretion essential for avian and reptile embryos?
9.How do the embryos of placental mammals excrete nitrogenous wastes?
10.What is the main nitrogenous waste produced by humans?
11.How is urea formed in the human body?
12.What organs make up the excretory system?
