what gas exchange happens in the respiratory system and what is the large blood vessel that carries blood from the heart to the lungs.

What causes temperature extremes in the desert

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Step 1 review the imaginary strand of dna below. note the complementary base pairs. a g c a a t c c g t c t t g g t c g t t a g g c a g a a c c step 2 to begin replicating this strand of dna, draw the two sides of the strand separating. step 3 now, draw the free-floating bases linking up with the separate sides. remember to follow the rules of complementary base pairing. step 4 draw the two resulting dna strands.