Biology experiments often require observing living organisms. We need to use microscopes to observe ___. A. cells B. atoms C. molecules D. particles 相关知识点: 试题来源: 解析 A。本题考查专业知识。生物实验经常需要观察生物体,我们需要使用显微镜来观察细胞。选项 B“atoms”原子;选项 C“molecules...
Whalesarethelargestlivingorganisms(生物)livingonthesurfaceoftheearth.Anadultbluewhaleweighsupto173tonswith30metersinlength.Whenawhalediesintheocean;itsbodyusuallyfallstotheseaflooranda"specialdeep-sea-ecosystemwillbeformedinalongtime.Scientistsgiveanametothis:thewhalefall. 米严毛其生形世 Recently,somescientist...
A. It is the same for all living organisms. B. It determines all physical characteristics. C. It can be easily changed. D. It is unique to E. ach individual. 相关知识点: 试题来源: 解析 D。DNA 对于每个个体是独特的。选项 A 不是所有生物的 DNA 都相同;选项 B DNA 不是决定所有物理特...
As we can see, the world population is growing rapidly day by day. So enough fresh water is needed to feed such a big population. What’s more, with the development of industry, factories and vehicles produce poisonous gases or wastes, which consequently results in the pollution of water. ...
It may seem weird to classify organisms according to such details, but with or without a nucleus is not trivial at all. The division between prokaryotes and eukaryotes (all organisms with a nucleus inside their cells) is of extreme importance in biology, and is the result of a major ...
The biosphere is often broken down into smaller groups of related things to make it easier to understand its structure. For example, we may break it down like this: Biosphere- The biosphere contains all living things on Earth. Biome- A biome is a large collection of organisms occupying a ma...
how to dispose of rubbish is a very important thing. First, rubbish is a great pollution in city, and how to deal with them has been a big problem .There are many ways such as classify ,collect, sometimes we can buy the rubbish and don’ t forget to deal with the polluted water ....
Deoxyribonucleic acid (DNA) is an organic molecule found in the nucleus of cells. It contains the genetic instructions for all living organisms. DNA is the molecule that encodes genetic information in cells and is made up of adenine, cytosine, thymine, and guanine. DNA molecules are highly stab...
For decades, the medical community has looked to a variety of reasons for why we age, and the consensus is that no one dies of old age; they die of age-related diseases. That's because ageing is not a disease – it is inevitable. But what if everything you think you know about age...
A cell is described as the basic functional unit of life in all the living organisms. It is the smallest and biological unit and therefore, also known as the building blocks of life. It consists of various cell organelles that make a cell fully functional....