If a carbon atom has 6 electrons (2 in the first energy shell and 4 in the 2nd energy shell), how many bonds can it form

In the presence of oxygen, glycolysis is followed a. the krebs cycle b. lactic acid fermentation c. alcoholic fermentation d. photosynthesis

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

Light sensitivity in euglena is provided by the