Most ocean food chains depend on phytoplankton as primary producers. Where in the ocean do phytoplankton live?

sunlight and water

explanation:

answer; ///(b) it is composed of four protein chains and four heme groups;

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101