You're observing a veterinarian performing surgery on a lizard. What anatomical feature is of greatest concern to the veterinarian when cutting into the lizard's midline? A) Ventral abdominal vein
B) Dorsal aorta
C) Splenopancreas
D) Sacral ribs

when it is at an intermediate population density

the answer is d p: cell, q: organ, r: organ system, s: tissue

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.