When blood pH decreases, the urinary system helps to maintain the extracellular fluid pH by 01.
excreting excess hydrogen ions and reabsorbing bicarbonates
2. synthesizing buffers
03
retaining carbon dioxide in the filtrate
4. excreting filtrate

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation:

what is this saying?

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.