So molecules like this ended up on Earth. In fact, what we call meteorites are pieces broken away from comets and asteroids that came in our atmosphere and left their extra-terrestrial organic matter on the surface of primitive Earth.这样的分子最终来到了地球上。事实上，我们所说的陨石是来自彗星...
It may consist of atoms of a single chemical element, as with oxygen (O2), or of different elements, as with water (H2O). As components of matter, molecules are common in organic substances (and therefore biochemistry) and are what allow for life-giving elements, like liquid water and bre...
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Some molecules are more prone to linger in the air or adhere to surfaces, prolonging the odor. 4 What role do smells play in nature? In nature, smells play a critical role in communication among species, navigation, and signaling danger, such as the scent of smoke indicating fire. Share ...
A、B部位横裂纹时更换，其他部位上平面、侧面横裂纹长度不大于裂纹处断面周长的20%，底面横裂纹长度不大于底面宽度的20%时焊修（测量周长或宽度时，铸孔计算在内，测量裂纹长度时，铸孔不计算在内），焊波须高于基准面1mm～2mm，焊修后进行热处理；大于时更换。
根据第二段中The middle of the dandelion's parachute is able to sense the amount of humidity (湿度) by absorbing water molecules (分子) in the air.Using signals about humidity information,they either open their parachutes and fly off or they close them and stay where ...
We had the standard mold air testing done when we bought the house. The levels came back in a range acceptable to the bank. I didn’t know at the time thatmost functional medicine doctors say those tests are not enough. They aren’t sensitive enough for many mold spores and may not pi...
While you can't mix pee and bleach, there is a way to deal with the situation when your whole house smells like dog urine. There are a lot of commercially available options marketed as enzymatic cleaners. These products contain enzymes, which are biological molecules that break down compounds...
Organic chemistry is all about studying carbon-based molecules. These are found in living things, like plants and animals, but also in things we use every day, like plastics, fuels, and medicines. Organic chemists learn how these molecules form, react, and create new substances. ...
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