What are the characteristics of animal activities and what are the characteristics of marine animal

Characteristics of zebrafish activity.

The characteristics of marine animal activities are that there are more species in the south and less in the north, that is, there are more species in the South China Sea, while there are fewer species in the Yellow Sea and Bohai Sea. In addition, there are more than 1,580 species of marine organisms distributed on China's tidal flats. Among them, mollusks were the most abundant with 513 species, followed by seaweeds with 358 species, crustaceans with 308 species, and few other taxa.

There are more than 200,000 known species of marine animals, which are diverse in morphology, ranging from microscopic single-celled protozoa to higher mammals, cetaceans. It is widely distributed, from the equator to the polar seas, from the sea surface to the depths of the seabed, from the coast to the bottom of the trench in the ultra-abyss. Marine animals can be divided into three large groups: marine invertebrates, marine protochordates, and marine vertebrates.

1. Fish characteristics: **Covered with scales, it is an ectothermic animal.

Ectotherms with fins, gills that breathe. 2. Amphibians.

Characteristics: Body without scales or body hair, tongue bifurcated, inverted, able to stretch outward, fish mating and fertilization in water. 3. Reptiles.

Characteristics: **Covered with scales or shields, with waterproof skin, water dispersion, ectothermic. 4. Characteristics of birds: the whole body is covered with feathers, the body is streamlined, and there is a beak. <

1. Fish characteristics: aquatic animals (can only live in water). **Covered with scales, it is an ectothermic. An ectotherm animal that has fins (can swim in water) and breathes with gills. In vitro fertilization, mainly oviparous, partly viviparous and ovoviviparous.

2. Amphibian characteristics: they need to spend their juvenile period in the water. It has adapted terrestrial.

The skeletal structure, with limbs, is moist and has many glands. There are no scales or body hair on the body. The tongue is bifurcated, inverted, and can stretch outward. Fish mating and fertilization take place in water. The larvae breathe with gills, while the adults breathe with **, the inner wall of the mouth and the lungs.

3. Reptile characteristics: terrestrial animals. **Covered with scales or shields, with a waterproof outer skin, water loss, ectotherm (dependent on outside temperature or heat sources to change its body temperature).

It is mainly found in warmer parts of the earth. In vivo fertilization, oviparous or ovoviviparous. The eggs are laid on land, and the eggs are covered with a waterproof outer package.

4. Bird characteristics: the whole body is covered with feathers, the body is streamlined, and there is a beak. The eyes are on both sides of the head, and the neck is long and flexible and can be turned 270 degrees. The forelimbs are specialized into wings, and the hindlimbs have a scaly outer skin with four toes. Thermostatic animals.

They can generate heat through their own physiological processes, and they can maintain a high and constant body temperature even when the outside temperature is very low). The average body temperature is higher than that of mammals.

It is about 10 degrees higher (42 degrees on average) and oviparous.

5. Mammalian characteristics: there is a spine connected by many vertebrae in the body; The body is covered with hair, and there is oral chewing and digestion, which can improve energy and nutrient intake; Viviparous (platypus.

except Echidna), lactation; Constant temperature. The body temperature can also be kept relatively constant when the ambient temperature changes, which reduces the dependence on the external environment and expands the distribution range.

Animals are diverse and generally divided into terrestrial animals, aquatic animals, amphibians, etc.

Terrestrial animals, aquatic animals, and amphibians are classified according to the living environment of animals. It is a terrestrial animal that can only survive on land, an aquatic animal that can only survive in water, and an amphibian that can survive both on land and in water. Animals generally feed on organic matter, can feel and move.

Characteristics of the animals:

The characteristic of animals is that there are many kinds of animals, and the characteristics of animals are that they have a variety of behaviors, and the characteristics of animals are that they have a certain selectivity and adaptability to the environment. The characteristics of animals are that each animal has a different appearance and different living habits. The basic shape features of an animal's body are fixed during development, usually earlier than embryonic development, but some may be deformed later in life.

Animals can't live without food, water and habitat. The need for reproduction and population characteristics. Animals have regularities, such as migration rules, courtship habits, hibernation habits, and animals are a large group of multicellular eukaryotes.

Parrots not only unconsciously repeat the sounds they hear, but they also learn words and carry out conversations.