Elements are those substances that contains atoms that are indivisible by any chemical means.
The properties of these elements varies in a particular manner, therefore they are distributed into groups.
Based on the descriptions from the question, the groups are:
- Group 7: Chlorine is a highly reactive gas found in group 7 because it contains seven valence electrons in its outermost shell.
- Group 1 : Potassium is an extremely reactive metal found in group 1 because it contains only one valence electron in its outermost shell.
- Group 4: Silicon is a metalloid that belongs to group 4 because it contains four valence electrons in its outermost shell.
- Group 2: Calcium belongs to group 2 because it contains two valence electrons in its outermost shell.
- Group 0: Neon is an inert gas found in group 0 because its outermost shell is completely filled up.
- Group 3: Aluminum is the most abundant metal found in he earth crust which belongs to group 3. This is because it contains only 3 valence electrons in its outermost shell.
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Explanation: DNA comparisons can show how related species are. Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change. Hope it helped☺
Answer:
RANDOM MATING
Explanation:
random mating
The Hardy Weinberg principle of genetic equilibrium defines that gene and allelic frequencies will remain the same among the generations in an infinitely large interbreeding population. In this population the mating among the members of the population is random and no selection, migration and mutation will occur.
The question is asking essentially about the location of the eardrum: if it asks where it is that eardrum vibrates, then it is also asking where there eardrum is located: and this is is in the middle ear: answer b.