An individual's EKG shows changes in atrial contraction. Which image shows contraction of the atria?

looks like the answer is     c     to me!

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.

i think it is d. objects resist changes in their state of motion.