i m having exam 1 more week. while revising i have a lot of question.
1. i found out that the scientific investigation (hypothesis, conclusion n etc) differs from other book. different book have own sequence. which is the correct sequence?
2. what is endocrine system?
3. in the chapter, movement of substances across the plasma membrane, i learnt that facilitated diffusion does not require energy because the carrier protein moves molecules down to their concentration gradient. then , why carrier protein in animal cell need active transport to pump sodium ions out and potassium ions into the cell when the ions also going down concentration gradient ( potassium in cell is higher n sodium in cell is lower than outside)
4.we should eat more unsaturated fat or saturated fat. why? penguin feet is made from what type of fat? why is this type of fat important?
5. how do some bacteria that are found in deep sea volcanic vent survive at such high temperature?
thank you very much