Both 1 and 2 are advantages. I and III only e. II and III only 63. Urea is a. insoluble in water. Protonephridia are excretory structures found in a. flatworms. I and III only e. II and III only 72.
Malpighian tubules are excretory organs found in a. earthworms.
The main nitrogenous waste excreted by birds is a. ammonia. In a laboratory experiment, one group of people consumes an amount of pure water, a second group an equal amount of beer, and a third group an equal amount of concentrated salt solution that is hypertonic to their blood. Their urine production is monitored for several hours. There will be no significant difference. Organisms categorized as osmoconformers are most likely a. terrestrial.