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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Answer:
human biology
Explanation: Human biology is the branch of biology that deals with human beings and human populations. It includes all the aspects of the human as an organism including genetics, ecology, anatomy and physiology, anthropology, and nutrition.
All of the statements above
except "most only thrive in narrow range of environments," is true
for the eubacteria. They are organisms that can be found in every habitat on
Earth. Some of these bacteria are responsible for the diseases that we contract
but they also play a large role in the Earth's ecosystems as decomposers and
heterotrophs. They have genetic structures that help them thrive and survive in
extreme environments.
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