Some types of atoms form more than one covalent bond with another atom. what determines how many covalent bonds two atoms can make? can you explain?

The idea that all living things are made up of cells is considered scientific law. this means the idea is an emerging scientific idea that has a logical explanation. has been tested with similar results at least twice. is supported by scientific consensus and a large amount of evidence. has been rejected only once by the scientific community

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

What should be the strand of complementary dna produced by the strand of dna shown below cgt ata