In many cells, the adhesion to the extracellular matrix through integrins causes the activation of kinases in the cytoplasm. this suggests that:
a. integrins promote the activation of signal-transduction pathways.
b. integrins are kinases.
c. extracellular matrix proteins are receptors and integrins are ligands.

Secondary succession would most likely be taking place in a(n)

Maria wanted to grow a fern in her backyard. acting on a suggestion from a friend, she collected brown dots from the underside of a fern's leaves and then potted them. after a few days, maria saw small fern leaves erupting from the pot. which statement explains this phenomenon? a. the fern transitioned from gametophyte generation to sporophyte generation. b. the fern grew as a result of mitosis. c. the fern transitioned from sporophyte generation to gametophyte generation. d. the fern grew to be genetically identical to its parent plant.

Which skeletal system is represented by the shaded portion of the skeleton? spongy skeleton compact skeleton axial skeleton appendicular skeleton