The science of how Messi keeps the ball close to himself photo credit: ZaleDesigns Messi is a magician with the ball at his feet. He's in my opinion the best player in the sense that he can control the ball so well, runs so fast with the ball & changes the direction at full speed like it's a walk in the park. For starters he started playing very early (at 3) which is crucial if you want to be a good player. In that aspect, he's God gifted as he had dribble skills which is genetic in my opinion. Height He is short which means a low center of gravity so it's difficult to push him off the ball. That's why we see that anyone rarely can topple him down, instead players much larger than him lose possession to him. So his short height suits his style of play & is a blessing in disguise. Change of pace Messi changes his pace really well. He starts slow and runs directly at the defender which means the defender has to stop & focus on him. When he reac...
Biology - Animalia Kingdom
Introduction
The organisms, which are eukaryotic, multicellular, and heterotrophic, are categorized as Animalia kingdom.
The organisms of Animalia kingdom have no cell-wall.
Most of animals of Animalia kingdom are mobile.
Classification of Animalia Kingdom
Based on the extent and type of the body design differentiation, Animalia kingdom classified as −
Porifera
Coelenterata
Platyhelminthes
Nematoda
Annelida
Arthropoda
Mollusca
Echinodermata
Protochordata
Vertebrata
Pisces
Amphibia
Reptilia
Aves
Mammalia
Let’s discuss each of them in brief −
Porifera
The literal meaning of ‘porifera’ is the organisms with holes.
The organisms of porifera are non-motile and attached to some solid support.
The examples of this group are Sycon, Spongilla, Euplectelia, etc.
Coelenterata
Organisms of coelenterata group live in water.
The organisms of this group have cavity in their bodies.
Hydra and sea anemone are the common example of coelenterate.
Platyhelminthes
The organisms of this group do not have true internal body cavity or coelom; so, they neither have well-developed organs.
The bodies of organisms of this group are flattened from top to bottom; therefore, they are also known as flatworms.l
Planareia, liverfluke, tape worm, etc., are the typical examples of this group.
Nematoda
The organisms of nematode have cylindrical body.
The organisms have tissue, but as such no well-developed body (i.e. no real organ).
The filarial worms (causing elephantiasis disease), roundworm in the intestines, etc., are the common examples of nematodes.
Annelida
The organisms of annelida group live almost everywhere including fresh water, marine water as well as on land.
Earthworms, nereis, and leeches are the familiar examples of annelida.
Arthropoda
Arthropoda, probably, is the largest group of animals.
The animals of this group don’t have well defined blood vessels rather there is an open circulatory system.
The literal meaning of arthropod is jointed legs; so, they have jointed legs.
Prawns, butterflies, houseflies, spiders, scorpions, etc. are the typical examples of arthropod.
Mollusca
The organisms of mollusca are invertebrate.
Most of the organisms of Mollusca group live in water.
Snails and mussels are the typical example of Mollusca.
Echinodermata
The organisms of Echinodermata have spiny skinned.
Echinodermata are free-living marine organisms.
The examples of echinodermata are starfish, sea urchins, feather star, etc.
Protochordata
The organisms of protochordata are normally marine. E.g. Balanoglossus, Herdemania, and Amphioxus
The organisms of protochordata show a typical feature of body design, called as notochord; however, it does present there throughout the life.
Vertebrata
Vertebrata has been discussed in a separate chapter.
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