How are species adapted to specific environmental conditions?

Amoeba – secretion occurs through the entire surface of the body, as well as through a special vesicle – the contractile vacuole.
Chlamydomonas – contractile (pulsating) vacuoles serve to release excess water.
Hydra – hydra has no excretory organs. Metabolic products are excreted through the ectoderm, i.e. across the entire surface of the animal’s body.
Earthworm – the excretory system is represented by metanephridia. Crucian carp are the excretory organs of the kidney. Two ureters depart from the kidneys, through which urine flows into the bladder, and is removed to the outside through the opening behind the anal.
Swallow – excretory organs of metanephric kidneys. The ureters open into the cloaca, there is no bladder.