It is projected that an increase in carbon dioxide levels in the atmosphere will MOST LIKELY lead to
a) higher than average sea levels b) lower than average hurricane levels c) lower than average ocean temperatures d) higher than average ice levels in arctic

Option a) higher the average sea levels.

Explanation: Carbondioxide is also known as greenhouse gas. When carbondioxide concentration is higher in the atmosphere, it prevents the reflected sunlight from going into the atmosphere which increases the temperature of the surrounding air. This phenomenon is called global warming. This increase in temperature starts melting of ice which are present on mountains and thus, increases sea level.

it has one origin of replication, but it proceeds in two directions - d)