Answer:
The correct answer is single,double and triple covalent bonds .
Explanation:
A carbon atom can form a single bond with another carbon atom example ethane.
A carbon atom can form a double bond with another carbon atom example ethylene
A carbon atom can form a triple bond with another carbon atom example acetylene.
But during the formation of Carbon carbon single bond or double bond or triple bond the valency of carbon atom that is 4 is always maintained.
The answer is B. Bacteria blooms and decreased underwater photosynthesis causes asphyxia, killing the fish.
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Answer:
Angiosperms evolved during the late Cretaceous Period, about 125-100 million years ago.
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