Compared to its surroundings, the concentration of solutes is low inside a cell. So, the cell is in a for its transport from the cell to its surroundings. This type of transport is called
solution. A particular solute in this cell uses energy
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Passive transport.

Explanation:

Osmosis occurs in the cell which is a type of passive transport. Passive transport refers to the transfer of solutes from one place to another without the expenditure or use of energy. Osmosis refers to the transfer of solutes from outside the cell into inside the cell through a semipermeable membrane which allow solutes which are small in size. This process occurs only when the concentration of solute is different inside and outside of the cell. while active transport is a type of transport which transfer solutes from one place to another with the use of energy in the form of ATP.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

hope this !