According to theories concerning the origin of life, the atom shown is a likely choice for the basic element of all livings things because it a)is small and unstable. b)is relatively stable and can form four covalent bonds. c)forms four ionic bonds with other elements and itself. d)is large and takes up enough space to fill the structure of a cell.

B. The atom is able to form 4 covalent bonds                          

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest