Why is an ecosystem's net primary production (npp) lower than its gross primary production (gpp)?
a. npp reflects the loss of matter due to respiration by the primary producers.
b. npp reflects the gain of oxygen due to respiration by the primary producers. c. gpp reflects the loss of matter due to respiration by the primary producers.

If a cell's main function is to produce proteins to be excreted, which organelles would you expect to be larger

When in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? view available hint(s)when in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? active transportexocytosis

The green colored pigment in chloroplasts is? a. nitrogen b. chlorophyll c. chlorophorm d. chlorofloromethane