Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results. -ally :)
A semipermeable membrane is any biological or synthetic membrane that allows certain molecules or ions to pass through while restricting others.
the human body's system to reproduce
The 3rd one because when you burn coal it releases toxic"air".
answer to question 7 - Tube 4: Amylase present, body temperature (37ºC)
answer to question 9 - Hydrogen bonds between water and another substance