Hormones can travel through the blood and not affect all tissues; only cells possessing sites for that particular hormone are affected, and these cells are called cells.

[content deleted] - user123802726recklesschicken

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.