Whats wrong with this structure h-c=c-h

"Each carbon atom has only three covalent bonds instead of the required four. "

Explanation:

In the covalent bond the chemical bonding takes place by distribution of electrons among the atoms. The electrons that has been paired are also termed as the bonding pairs, they are also very much constant and balanced of attractive and repulsive forces among atoms.  This covalent bond helps in other unstable atom in getting stable, by archiving electron from other atoms which will help them in forming a complete electron shell.

rising sea temps which are causing coral reefs to bleach and die out

glaciers are melting causing sea levels to rise wgich could flood out land

explanation:

the right side of the picture going down is:

polymerase

protein

transport vesicle

modified protein

the left side of the picture going down is:

dna helix

single-stranded rna

endoplasmic reticulum

ribosome

golgi apparatus

protein released from vesicle

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