1) they have similar chemical properties.
for example fluorine from the 17th column is a non metal so does all the elements of that group.
2)they have same valence electrons in their outermost shell
example
electronic configuration of
hydrogen 1, lithium 2,1, sodium 2,8,1 and so on.
3) have same valency.
Answer:
Mutation and Recombination
Answer:
By running them under water. The water will separate the rocks from the dirt.
So carbon dioxide can diffuse from the leaf
Answer:
i believe the answer is C: hospitalizations