Answer:
earth is the only planet we know of that sustain life please mark me brain list
Answer: 3
Explanation:
All elements in group 3 have 3 levels of energy.
Na (sodium) has 3 valences the inner has 2 electrons, the middle has 8 electrons and the outer has 1 electron.
This will continue across the group 3 adding one more electron to the outer valence until Ar (argon).
Remember the Octet rule of 8..?
Answer:
An invasive species enters the environment.
Explanation:
All other answers already naturally happen in an environment so they are stable. But if an invasive species enters, the ecosystem will be less stable because invasive species dominate ecosystems which isn't natural to the animals that live there. So for example, if someone introduced an invasive species to the ecosystem, it can cause many changes like if it was a predator, there'll be less primary consumers (the animals that eat plants) because the invasive species isn't natural to them.
Gel electrophoresis is a method used for the separation of DNA fragments based on their sizes. We have labelled the steps and you can know the sequence of the steps by going through attached image.
The technique is very important for the molecular analysis and identification of new genes. It is also useful in identification of genetic sequence of a particular gene.
Hope it helps!
D. Would be the correct answer.