Quick Answer: How Do Crocodiles Excrete Waste?

How do aquatic animals excrete waste?

Marine mammals have some of the most efficient kidneys known.

Their kidneys can resorb most of the water from the urine, leaving a very concentrated solution of urea and salts to be excreted.

They also are very efficient at removing water from the rectum, so that food wastes pass out with a minimum of water..

What happens if nitrogenous waste are not removed from the body?

Excess nitrogen is excreted from the body. Nitrogenous wastes tend to form toxic ammonia, which raises the pH of body fluids. The formation of ammonia itself requires energy in the form of ATP and large quantities of water to dilute it out of a biological system.

Are sharks dinosaurs?

Sharks. … Today’s sharks are descended from relatives that swam alongside dinosaurs in prehistoric times. In fact, the largest predator of all time was a shark called a Megalodon. It lived just after the dinosaurs, 23 million years ago, and only went extinct 2.6 million years ago.

Does fish drink water?

Fish do absorb water through their skin and gills in a process called osmosis. … As well as getting water through osmosis, saltwater fish need to purposefully drink water in order to get enough into their systems.

How do reptiles excrete waste?

Aquatic reptiles excrete predominantly urea, while terrestrial reptiles excrete predomi- nantly uric acid to conserve water. All reptiles have a renal portal system, which can direct blood from the caudal extremities either through or around the kidneys.

Did alligators evolve from crocodiles?

The first alligator ancestors evolved some 245 million years ago. About 80 million years ago, during the Cretaceous period, crocodilians appeared. … Modern alligators are still closely related to their ancient ancestors and look much like their relatives did 80 million years ago.

Do crocodiles float when they die?

But a crocodile carcass can’t float forever.

Do humans excrete uric acid?

In contrast, mammals (including humans) produce urea from ammonia; however, they also form some uric acid during the breakdown of nucleic acids. In this case, uric acid is excreted in urine instead of in feces, as is done in birds and reptiles. Uric acid is a compound similar to purines found in nucleic acids.

What animal has been on Earth the longest?

12 Oldest Animal Species on EarthSturgeon – 200 million years old. … Horseshoe Shrimp – 200 million years old. … Lamprey – 360 million years old. … Coelacanth – 360 million years old. … Horseshoe Crab – 445 million years old. … Nautilus – 500 million years old. … Jellyfish – 505 million years old. … Sponge – 760 million years old.More items…•

Can a jaguar kill a Nile crocodile?

A full-grown jaguar will be able to take any crocodilian, does not matter their species, a Nile or Orinoco croc, or any other cayman, even the black cayman, if the size of their head fits on its mouth and it can crush their skull with their single mortal bite.

Are sharks Isosmotic?

Sharks – Osmoregulation. The blood of the shark is usually isotonic to its watery home. This means that there is an equal concentration of solutes within their body as there are in the ocean in which they live. So, they maintain osmotic balance with the seawater.

How do you excrete fish waste?

To maintain their water balance, marine fishes drink large quantities of seawater, retaining most of the water and excreting the salt. Most nitrogenous waste in marine fishes appears to be secreted by the gills as ammonia. Marine fishes can excrete salt by clusters of special cells (chloride cells) in the gills.