What transforms the spinal cord in vertebratesanimals
Answers
Explanation:
The numerous invertebrates’ phyla are characterized by a wide range of shapes and way of living. All the vertebrates (Vertebrata), instead, have a similar body. Despite their limited differences and the modifications in time, the vertebrates have conquered on just emerged lands, but also the sky. Vertebrates include some of the biggest organisms that have ever lived on Earth and our species also belongs to them
The vertebrates are characterized by a spine, or backbone, consisting of vertebra that surround the nerve cord. Between the vertebra are the cartilage disks, that make the spine a flexible bone structure. Connected to the vertebra are the muscles that allow the movement of the different parts of the spine. These animals have a bone internal skeleton, mainly made up of living material that grows with the animal until it reaches its definitive dimensions.
Fish
Fish have been the first vertebrates to have appeared on the Earth. Their appearances can be the most diverse, depending on how they have adapted to the environments in which they live. A typical organ of most, but not all, fish is the air bladder, which is filled with gas and allows therefore the fish to change its specific gravity (i.e. the body weight/volume ratio) to swim up and down without moving its fins. Fish produce a huge number of eggs, since they have to go through many dangers and few can survive: cods lay up to six million eggs at a time. Fertilisation is mostly external: the female lays its eggs and the male fertilises them by coating them with its sperms. In this case, the fish are called “oviparous”, which means the embryo develops inside the egg after having been laid by the female. If instead the eggs are held inside the female’s body until the hatching, the fish are called “ovoviviparous”.
Amphibians
The word “amphibian” comes from the Greek and means “double life”, since these animals live partly in water and partly on land. Before becoming adults, they undergo changes that completely transform their appearance. From the eggs wriggle out the young animals, called tadpoles and looking like small fish: later on, the tadpole from a larva becomes a fully formed adult. During the metamorphosis, the tadpole begins to grow legs and its gills become smaller and smaller until they disappear: they are replaced by lungs, that are necessary to breath air. Finally, the tail is completely swallowed up into the body.
Reptiles
The word “reptile” comes from the Latin reptilis, which means “creeping”. Actually, the animals that best represent the entire class are snakes, but Reptiles also include such quadrupeds as tortoises and crocodiles. Reptiles look quite like Amphibians, but have something more: they can also live in dry areas, far from water. They have lungs to breathe and are commonly called “cold-blood vertebrates”; in fact the temperature of their blood depends on that of the environment, and is slightly higher than that, so it would be more correct to call them heterothermal animals, i.e. “whose body temperature varies”. Their body is coated in scales and they reproduce by laying eggs. Reptile reproduction is sexed, with internal fertilisation; their eggs, protected by a waterproof shell, are always laid on land (sometimes the eggs develop inside the oviduct).
Answer: Vertebral column is also called the spinal cord.
Explanation:
The spinal cord is a long, tube-like band of tissues. It connects the brain to the lower back of the body. Spinal cord carries nerve signals from brain to body and vice versa. These nerve signals helps to feel sensations and move our body. Any damage to the spinal cord can affect movement or function of body.
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