<span>. Estuaries have been called the "nurseries of the sea" because the protected environment and abundant food provide an ideal location for fish and shellfish to reproduce. Most commercially important fish species spend some part of their life cycle in estuaries. Besides fish, many species of birds depend on estuaries for food and nesting areas. Migratory birds use estuaries as stopover points for resting and feeding before continuing their journey. Marine mammals also use estuaries as feeding grounds and nurseries.</span>
The vascular cambium is a plant tissue located between the xylem and the phloem in the stem and root of a vascular plant. Its functions is for secondary growth. It makes new phloem towards the outside of the plant and new xylem towards the inside. Good luck!
Active transport is the process that would be used to transport calcium ions through the calcium pump.
