Answer:
EDTA is a chelating agent used to preserve samples for DNA extraction and as an anticoagulant
Explanation:
Ethylenediaminetetraacetic acid (EDTA) is a well-known chelating agent that binds metal ions (iron and calcium ions). In police cases, EDTA can be used for DNA extraction since this agent chelates metal ions in DNase enzymes which are contained in the samples, thereby reducing their activity and preserving DNA samples for a long time. Moreover, EDTA is also used as an anticoagulant for blood cells, which allows preserving the cellular components and the morphology of blood samples.
The answer is Sieve. hope that helped
The content of vaccine varies from vaccine to vaccine but it has some live form of the disease in the vaccine
Vaccine work by injecting a small amount of virus in the blood stream along some other agent which causes the body to produce antibodies which fight the infection
The school going kids receive vaccine because their body is no immunity and likely to be a carrier of diseases and spread them.
Numerous barriers can prevent sperm from reaching and fertilizing the egg, this can be that the Sperm may be defected, or lack the required number of mitochondria needed to help move the sperm. Also, if sperm had already fertilized the egg, there is a change that takes place to the membrane surrounding the egg preventing further sperm from fertilizing.
Well since cacti are usually found in hot and dry places they wont have much of a supply of water. so the cacti will grow and adapt over time to need less water; therefor, the cactus stem's structure benefits the plant because it has adapted to need less water. get it?
