Which of the following cell types are specifically responsible for the B cell response?

Which of the following statements is a valid conclusion of this experiment?

A) Balanus can survive only in the lower intertidal zone because it is unable to resist desiccation. B) Balanus is inferior to Chthamalus in competing for space on rocks lower in the intertidal zone. C) The two species of barnacles do not compete with each other because they feed at different times of day. D) The removal of Balanus shows that the realized niche of Chthamalus is smaller than its fundamental niche. E) These two species of barnacle do not show competitive exclusion. F) If Chthamalus were removed, Balanus's fundamental niche would become larger.

How do lymphatic capillaries differ from blood capillaries?

A) They contain red blood cells. B) They have a wall only one cell layer thick. C) They are made by lymphocytes. D) They contain plasma. E) They have "dead ends."

__________ are cells that synthesize bone, whereas __________ break down bone matrix.

Fill in the blank(s) with the appropriate word(s).

Which of the reef organisms in this Gizmo are producers?