Which of the following may happen to astronauts when they return to earth from space? they may feel dizzy because the flow of blood to and from the heart to the brain is affected in space. they may feel dizzy because the heart pumps more blood per beat on earth than in space. their heart rate may slow down because there is more blood to circulate around the body. their heart rate may slow down because there is less blood to circulate around the body.

Their heart rate may slow down because there is less blood to circulate around the body. and aslo the lack of pull of blood

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )