Help with a few biology questions, a simple biology problem, help

Articular capsule, articular head, articular fossa, articular cavity, articular surface.

Articular cartilage. Energy circulation, material circulation.

Composition proportional dynamic equilibrium.

Body segments. Surface. Mucous.

The structure of the joint includes (joint capsule, joint head, joint socket, joint cavity, joint mian) There is a layer (articular cartilage) on the surface of the joint head and socket to reduce friction.

Animals contribute to the (material energy) cycle in the ecosystem.

In an ecosystem, the number and proportion of various organisms are always maintained in a state of dynamic equilibrium, and this phenomenon is called ecological balance.

The bodies of annelids are made up of segments that are similar to each other.

Annelids rely on (epidermis) for gas exchange with the outside world.

Fish have scales on the body surface

1.Articular surfaces (including articular head, articular fossa, articular cartilage), articular capsule, and articular cavity.

2.Synovial fluid. 3.Substance.

4.The quantity and proportion are relatively stable.

5.Annular segments.

6.Moist body walls.

Not all fish have scales.

1.The structure of the joint includes three parts: the joint surface, the joint capsule, and the joint cavity, the joint surface is the contact surface of two (or more) adjacent bones, among which the slightly convex side is called the joint head, and the slightly concave side is called the joint fossa, and the joint head and the joint fossa surface have a layer of smooth articular cartilage, which can reduce friction during exercise and also cushion the vibration during exercise. 2.

Animals contribute to the circulation of matter in ecosystems 3The composition and proportion of various organisms in the ecosystem are always maintained in a relatively stable state, and this phenomenon is called ecological balance. 3.

The bodies of annelids are made up of segments that are similar to each other. 3.Annelids rely on the body wall for gas exchange with the outside world (there are a large number of capillaries in the body wall of annelids, hemoglobin in the blood, which can carry oxygen, and the oxygen in the atmosphere can be dissolved in the solution of the body wall, and then enter the capillaries in the body wall for gas exchange) 4

Fish have scales on the surface of their bodies and mucus on their bodies (which makes the fish less resistant to water when swimming).

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Biology is a science that studies the structure, function, occurrence and development of living organisms (including plants, animals, and microorganisms), and is a part of natural science. The aim is to <>

<> elucidate and control the activities of life, transform nature, and serve the practices of agriculture, industry, and medicine. <>

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Biology is a science that studies the structure, function, occurrence and development of living organisms (including plants, animals, and microorganisms), and is a part of natural science. The aim is to <>

<> elucidate and control the activities of life, transform nature, and serve the practices of agriculture, industry, and medicine. <>

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Biology is a science that studies the structure, function, occurrence and development of living organisms (including plants, animals, and microorganisms), and is a part of natural science. The aim is to <>

<> elucidate and control the activities of life, transform nature, and serve the practices of agriculture, industry, and medicine. <>

<>What the hell are you? Glycolysis, carbon dioxide and water, the same and suitable, anaerobic glycolysis and aerobic mitochondrial respiration, cytoplasmic balance, such as quercetin is a glucose transporter-1 (glut-1) inhibitor, restricting glucose intake can lead to a decrease in cell productivity by inhibiting the Wasals effect of tumor cells, activating cell AMPK, so that p53 inhibits cell growth. <>

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Organisms: Organisms refer to living organisms with kinetic energy, and there are about 500,000 species of plants and more than 1.5 million species of animals on the earth. A wide variety of organisms not only sustains the sustainable development of the natural world, but also is the basic condition for human survival and development.

But the number of animals living has decreased dramatically, to only one-tenth of the original number of animals on Earth. Humans and other living beings live together in the beautiful home of the biosphere. The biosphere includes the bottom of the atmosphere, most of the hydrosphere and the surface of the lithosphere.

The biosphere is the largest ecosystem, including forest ecosystems, freshwater ecosystems, wetland ecosystems, marine ecosystems, urban ecosystems, farmland ecosystems, etc. As big as Zheng <>

a Genetic mutation.

The mutation of the gene can explain that it has always been a red tomato, and now there is a yellow tomato (because there was no gene for the yellow tomato before. ）

If we talk about genetic recombination, then there must be a gene for the yellow tomato [and in this way, the yellow tomato must be a recessive gene (AA), and the red fruit is dominant (AA), then there is a heterozygous (AA) in the red tomato to form the yellow tomato (AA)], that is to say, this recessive gene originally existed, so that there is more than one yellow fruit tomato, there will be a lot. So it's not genetic recombination.

A gene mutations are sudden, heritable mutations in genomic DNA molecules.

Chromosomal aberrations: abnormal changes in the structure and number of chromosomes.

Genetic recombination: refers to the recombination of genes that control different traits in the process of sexual reproduction in an organism.

Because it was all red, and suddenly there was an extra yellow, so it couldn't be genetic recombination, it could only be A.

C should be selected, gene mutation does not necessarily have an impact on the organism, and it is a mutation in a certain part, which will not affect the whole, all of them are red, and there is no yellow gene in the gene at all, so it is impossible to be gene recombination, chromosomal mutation will definitely affect the organism, and the range of influence is larger, it can be the whole organism, so choose C