Since vitamin a and carotenoids are bound to proteins in foods, is necessary to release them for absorption.

The deserts of the sahara and australia are associated with

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

Acommon kind of mechanical weathering is called