Select the correct statement about the immune system. a. adaptive immunity is characteristic of invertebrates and vertebrates. b. all antigen receptors produced by a single b or t cell are identical and bind to the same epitope. c. antibodies are secreted by t cells.

B. All antigen receptors produced by a single B or T cell are identical and bind to the same epitope.

Explanation:

Antigen receptors are antibody protein anchored to the B-cell membrane.

They are all identical when the antigen receptors is located on one type of B cell making Binding between the receptor and epitope to occur since its structures are complementary. It's not identical when the antigen receptors is located on different types of B cell

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

passive transport is a movement of biochemicals and other atomic or molecular substances across cell membranes without need of energy input. unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy.

so, according to what that says, i believe it's hypertonic and hypotonic.

good luck!