observe the classification of chart and fill the blanks. any body answer
Answers
Answer:
Thanks for the point
Explanation:
संयुक्त क्रिया में-
O A. मुख्य क्रिया होती है
OB. सहायक क्रिया होती है
OC. मुख्य और सहायक दोनों क्रियाएँ होती हैं
OD. एक ही क्रिया होती है
Answer:
Observe the classification of chart and fill in the blanks.
Vertebrates → Fishes, Amphibians, Reptiles, Birds, Mammals
Explanation:
Vertebrates!
Fishes
A whale shark (Rhincodon typus) near a snorkeller in Australia. The huge fish feed on small organisms filtered from the water and are not dangerous to humans. Scuba diver, fishes, ichthyology, fish plates, marine biology, sharks, giant fishes
The first fishes are thought to have emerged some 518 million years ago during the Cambrian Period of Earth’s history. Today, there more than 30,000 species of fishes found in the fresh and salt waters of the world. Living species range from the primitive, jawless lampreys and hagfishes through the cartilaginous sharks, skates, and rays to the abundant and diverse bony fishes.
Amphibians
Amphibians evolved from fully aquatic tetrapods—(which were essentially “limbed fish”) who descended from lobe-finned fish—sometime between the Early Devonian Period (which began 419 million years ago) to the Early Pennsylvanian Subperiod (which began 323 million years ago). The name amphibian, derived from the Greek amphibious meaning “living a double life,” reflects this dual life strategy—though some species are permanent land dwellers, while other species have a completely aquatic mode of existence.
There are three living groups of amphibians (caecilians, salamanders, and anurans [frogs and toads]) that, collectively, make up more than 7,300 amphibian species. One similar tendency among amphibians has been the evolution of direct development, in which the aquatic egg and free-swimming larval stages are eliminated. Development occurs fully within the egg capsule, and juveniles hatch as miniatures of the adult body form.
Reptiles
Reptiles are air-breathing vertebrates. They have internal fertilization, amniotic development (in which the embryo develops within a set of protective extra-embryonic membranes—the amnion, chorion, and allantois), and epidermal scales covering part or all of their body. The major groups of living reptiles—the turtles, tuataras, lizards and snakes, and crocodiles account for over 8,700 species.
Reptiles evolved from amphibians during the first part of the Pennsylvanian subperiod (323 million to 299 million years ago) and retained many amphibian structural characteristics. While most reptiles feed on other organisms, a few are herbivorous (e.g., tortoises). As cold-blooded animals, reptiles tend to be limited to temperate and tropical areas, but, where they occur, they are relatively common; however, they are not as large or conspicuous as birds and mammals. Most reptiles are terrestrial, but a few are aquatic. They move about by creeping or swimming in a fashion similar to amphibians.
Birds
Birds make up any of the 9,600 living species unique in having feathers, the major characteristic that distinguishes them from all other animals. They are warm-blooded vertebrates more related to reptiles than to mammals. They have a four-chambered heart (as do mammals), forelimbs modified into wings (a trait shared with bats), a hard-shelled egg, and keen vision. Their sense of smell is not highly developed, and their auditory range is limited.
Although most are capable of flight, others are sedentary, and some are flightless. In a manner similar to their relatively close relatives the reptiles, birds lay shelled eggs. The young are usually cared for in a nest until they are capable of flight and self-feeding, but some birds hatch in a well-developed state that allows them to begin feeding immediately or even take flight. (Nesting activities similar to those of some birds are seen in the crocodilians.)
Mammals
There are approximately 5,000 species of mammals living today. Mammals differ from other vertebrate animals in that their young are nourished with milk from special mammary glands of the mother. Mammals are distinguished by several other unique features. Hair is a typical mammalian feature, although in many whales it has disappeared except in the fetal stage. The mammalian lower jaw is hinged directly to the skull, instead of through a separate bone (the quadrate) as in all other vertebrates. A chain of three tiny bones transmits sound waves across the middle ear. A muscular diaphragm separates the heart and the lungs from the abdominal cavity. Mature red blood cells (erythrocytes) in all mammals lack a nucleus; all other vertebrates have nucleated red blood cells. The oldest known animals classified as mammals evolved near the boundary of the Triassic and Jurassic Periods, some 200 million years ago.