which groups of invertebrates has a body plan that allows for gas exchange directly with the enviroment

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

Restless tectonic plates move (shift) between one and fifteen centimeters per year month day minute

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously