Which of the following is an example of a nonspecific immune response? a. the receptors of a b lymphocyte bind to an antigen. b. a t lymphocyte attacks and destroys a cancer cell. c. a plasma cell releases antibodies. d. a macrophage engulfs invading bacteria.

Where in the cell are ribosomes made?

Fill in the blank with the best word to complete the sentence. white blood cells protect against and aid in blood clotting when injuries are sustained.

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas