The increase in atmospheric carbon dioxide 3.5 billion years ago would have likely been contributed to by a) early cells undergoing anaerobic lactic acid fermentation. b)early cells using hydrogen sulfide in the formation of biomolecules. c)early cells beginning the process of photosynthesis and producing sugars. d)increasing colonies of cyanobacteria undergoing photosynthesis.

Which sequence represents a cross section of the bilayera hydrophilic head, hydrophobic tail, hydrophobic tail, hydrophilic headb hydrophobic tail, hydrophilic head, hydrophobic tail, hydrophilic headc hydrophobic head, hydrophilic tail. hydrophilic tail, hydrophobic headd hydrophilic tail, hydrophobic head, hydrophobic head, hydrophilic tail

What is the most important inorganic material for livings things? ! due tomorrow!

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper