The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

A complex organism contains multiple organ systems with different functions. Multiple organisms of a single species may form a group, called a population. Many populations of different species form diverse communities, and communities that share the same geographical space are part of a larger ecosystem.

A common idea of complexity is that complex things have a long complicated history, and that complexity must be understood in the context of processes in Nature generating systems with more parts, different parts, and special relations between various kinds of parts, forming a structure which must be described on …

Organisms are highly organized, coordinated structures that consist of one or more cells. Even very simple, single-celled organisms are remarkably complex: inside each cell, atoms make up molecules; these in turn make up cell organelles and other cellular inclusions.

Complex organisms need specialized cells because they are capable of performing more tasks than simple organisms.

One of these are the sponges (Porifera). They were long thought to have diverged from other animals early. They lack the complex organization found in most other phyla.

comb jelly

The right answer to ‘What has 13 hearts, but no other organ’ Riddle is “A Deck of Cards”.

Why do other living creatures have different colored blood? Well, all these animals have blue blood because they contain copper that binds to oxygen. But there aren’t any animals with pink blood. The only colors of blood are red, blue, green, yellow, and purple.

reddish

Yes, its blood is blue. Our blood contains hemoglobin that helps absorb oxygen and gives a red color. The octopus has a protein called hemocyanin that causes a blue color.

Some animals, such as the sea cucumbers, even have yellow blood. What could make blood yellow? The yellow coloration is due to a high concentration of the yellow vanadium-based pigment, vanabin. Unlike hemoglobin and hemocyanin, vanabin does not seem to be involved in oxygen transport.

Maybe you’ve heard that blood is blue in our veins because when headed back to the lungs, it lacks oxygen. But this is wrong; human blood is never blue. The bluish color of veins is only an optical illusion. Blue light does not penetrate as far into tissue as red light.

In a normal dog, 35% to 55% of the blood will be red blood cells. If the PCV is below 35%, the dog is generally considered anemic. Others tests to determine if a dog is anemic include the red blood cell count and the hemoglobin count.

These arthropods’ blood uses a different protein, called hemocyanin, to bind oxygen. Because that binding process involves an atom of copper, rather than iron, the blood has a blue appearance when it’s oxygenated, and little or no color when it’s not.

Giraffes are ruminants (like cows, sheep, and deer). This means that they have more than one stomach. In fact, giraffes have four stomachs, and the extra stomachs assisting with digesting food.

Squids have three hearts; one main heart and two branchial hearts. Octopuses and squid have three hearts. Earthworms have five hearts. Scientists are studying cockroach and hagfish hearts to help design solutions for human heart disease.