SpongeBob SquarePants is a primitive animal

Primitive (multi)cellular animals.

The sponge sponge is the most primitive multicellular animal, which has lived in the ocean 600 million years ago and has developed to more than 10,000 species, accounting for 1 15 of the marine animal species, and is a huge "family".

Sponges are the simplest multicellular animals in the world. There is no head, no tail, no trunk, no limbs, no nerves and no organs. The main components of sponge cells are calcium carbonate or silicon carbonate and a large amount of collagen.

The sponge has no obvious tissue, and there is a layer of cells on the surface and inner cavity, with a mesocolloid layer in the middle. The inner layer of a monosulcus sponge is made up of collar cells, whose main function is to cause water flow and capture food particles. The primary cells in the mesocolla, also known as amoebocytes, can deliver the food ingested by the collar cells to all parts of the body, and can evolve into a variety of cells that play a role in regeneration, and can generate female and male germ cells if necessary.

A kind of sponge.

SpongeBob SquarePants is a primitive multicellular animal.

In the classification of organisms, sponges belong to a large group of organisms in the phylum Pores, SpongeBob SquarePants is the most primitive multicellular animal, living in the ocean about 600 million years ago, because of its static posture, has been regarded by humans as a plant on the bottom of the sea for thousands of years.

It wasn't until the mid-19th century that it was discovered that the body of a sponge was made up of animal cells. Sponges are the simplest multicellular animals in the world, with no head, tail, mouth, limbs, digestive cavity, and no nerves and organs.

Although there are many types of sponges, they are generally very similar in structure, and the tens of thousands of small holes on the sponge are their "mouths". Through these "mouths", they swallow the surrounding seawater into their bodies and filter the food out of the seawater for consumption, while the remaining seawater and food debris are discharged through the outlet at the top of the water.

According to statistics, the seawater filtered by sponges every day is equivalent to tens of thousands of times its own volume, and some varieties of sponges can filter out more than 90% of the microorganisms in the water at one time. Adequate nutrition** allows them to grow very large, some weighing up to tens of kilograms.

Sponges are extremely regenerative and can not only restore damaged or lost parts, but also form a new adult from fragments or even individual cells. People take advantage of this characteristic to artificially breed sponges, cut the sponges into small pieces, tie them to the seabed stone shelf, and grow into them in two or three years.

Babies are seabed biosponges.

SpongeBob SquarePants is a primitive multicellular animal.

SpongeBob SquarePants is a sponge animal, also known as a multicellular organism. The biggest difference from other animals is that they have no organs or tissues, just cell differentiation, and they have different morphologies, such as lumps, tubes, forks, umbrellas, cups, fans, or amorphous. They are soft on the body, but they are very strong when actually touched, because the endoskeleton is made up of hard calcium or silicon needles and fibers.

SpongeBob SquarePants in the cartoon also inherits this characteristic, the whole is clean and spongy, and has an immortal body, no matter how it is destroyed, he can immediately return to his original appearance.

Unlike real multicellular creatures, SpongeBob SquarePants in cartoons can walk at will, but multicellular creatures are very difficult to move, and even if they can move, they are very limited, and they are often fixed in one place and do not move. But as the protagonist of the cartoon, there is nothing wrong with such a setting.

SpongeBob SquarePants is a square-shaped yellow sponge with only four fingers and often wears a white shirt, brown shorts, and a red tie. Wear a hat at Mr. Krabs' shop and make the tastiest burger in Beechburg. He often fights with the cashier Squidward, and goes to catch jellyfish with Patrick after work.

Because the "SpongeBob SquarePants" cartoon has a funny and funny atmosphere, SpongeBob SquarePants is loved by everyone, and it fights wits with the ruffian, falls in love with Squidward, and has fun with Patrick, bringing a variety of funny stories to the audience.

In addition, this cartoon won the national children's TV cartoon ratings championship, ranked first in the American cable TV network for 8 consecutive years, and has also become one of the favorite cartoons of Chinese children.

SpongeBob SquarePants is a primitive multicellular animal.

SpongeBob SquarePants is based on a sponge on the ocean floor, and sponge is a general term for primitive multicellular aquatic animals of the phylum Porous Animals. There is no mouth, no digestive cavity, and no central nervous system, and the whole body is covered with small pores with many flagella and a sieve-like ring that makes it easy to eat. In seawater, it is mostly grayish-yellow, brown or black lumps.

Sponges are distributed in the world's oceans, most of them live in seawater, and a few live in freshwater, and can reproduce asexually by sponge fragments or shedding protrusions. Sponges in freshwater produce structures that are highly resistant to environmental changes, called "bud balls". When the mother dies, the bud bulb falls off.

Sponges do not have gonads, and most sponges are hermaphroditic and prefer allogeneic fertilization.

Morphological characteristics of a sponge

The sponge has no mouth, no digestive cavity, and no central nervous system, and is a most primitive animal. The small pores that cover the body are filled with flagella and a sifted trap-like ring, which can be collected into the seawater with the swing of the whip, bringing in oxygen, bacteria, microalgae, and other organic detritus, which are then filtered through the rings and finally become nutrients for the survival of the sponge.

Sponges do not possess organs that perform various functions. Its most important structure is the water pipe system, which is mainly composed of water inlet holes, collar cells and water outlets. According to the arrangement of collar cells and the degree of development of water pipes, the ditch system can be divided into three basic types: single ditch type, double ditch type and double ditch type.