¿Por que las algas verdes se llaman de ese modo? ¿Tienen clorofila las algas pardas y las algas rojas? ¿Por que no son verdes estas algas? Razona tu respuesta.

They use the si unit, or metric system its all the same thing

Since we don't see a strand; i got answers off a sheet and the correct answer is "2".

Well,what i learned was that unlike many other  endothermic  reactions,  photosynthesis  does not absorb energy as heat. instead, during plants absorb energy from sunlight to turn carbon dioxide and water into oxygen and glucose, which is a type of sugar molecule. the energy is stored in the glucose molecules, ready to be used when needed.