Which of these cells of the dermal tissue of plants prevent water loss and control gas exchange?

parenchyma cells
guard cells
phloem cells
companion cells

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.

All ova contain sex chromosomes corresponding to: x y xx xy

Need the diagram below, which is not drawn to scale, shows the position of the earth, moon, and sun. what type of eclipse occurs when the earth, moon, and sun are lined up in the order shown? a. planetary eclipse b. solar eclipse c. martian eclipse d. lunar eclipse