In cellular respiration, the energy for most atp synthesis is supplied by:

a. high energy phosphate bonds in organic molecules

b. a proton gradient across a membrane

c. converting oxygen to atp

d. transferring electrons from organic molecules to pyruvate

e. generating carbon dioxide and oxygen in the electron transport chain

The kidneys, ureter, bladder, and urethra the body maintain homeostasis through the process of a. excretion b. specialization c. respiration d. digestion

What are the formed elements (cell or parts of cell) in blood and what are their functions ?

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism