Carbon is a vital part of the phospholipids that make up cell membranes and the carbohydrates that make up cell walls. which of the following allows carbon to bond with up to four other atoms at a time and form the macromolecules that are essential to life? a. the six protons in its nucleus b. the six neutrons in its nucleus c. the two electrons in its inner shell d. the four electrons in its outer shell

The correct answer is option D, that is, the four electrons in its outer shell.  

Carbon is a very common constituent of matter as it can combine with other elements and with itself. It can produce a huge array of compounds, varying in size from just a few atoms to thousands of atoms.  

Carbon is a nonmetal in the periodic table group 14. Carbon has four valence electrons, the valence electrons refer to the electrons in the outer energy level of an atom, which takes part in chemical bonds.  

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.