In carbon dioxide (co2), there are two oxygen atoms for each carbon atom. each oxygen atom forms a double bond with carbon, so the molecule is formed by two double bonds. two double bonds means that the total number of electrons being shared in the molecule is

4

Explanation:

The carbon dioxide has the formula CO2 and the center of this molecule is carbon atom. This carbon atom is joined by two oxygen atoms which gives it a structure of O=C=O.

The carbon atom has 4 electrons in the outermost shell and it requires more 4 electrons to complete its octet.

Double covalent bond is formed in between the oxygen atom and carbon atom to make carbon dioxide.

It gets the rest 4 electrons from the oxygen molecules.

a time line cause it goes from 685 to 978

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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