Which of the following best describes what causes water molecules to exhibit properties such as cohesive and adhesive behavior?

water molecules are polar, having partially positive and partially negative ends.
water molecules have both a hydrophobic end and a hydrophilic end.
water molecules are capable of dissolving both polar and nonpolar substances.
water molecules have a high molecular weight, making them very dense.

Explain nonnuclear inheritance. ~ ap biology

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.