T-cell receptors structurally resemble Select one: a. the Fc portion of immunoglobulins. b. MHC class I molecules. c. secreted antibodies. d. a single Fab of immunoglobulins.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Types of scientific inquiry that biologist engage in that cannot be completely controlled

Explain how scientists use geologic time to determine the age of landforms.