Which of the following is not a way that humus affects the properties of soil? a. humus expands with increased moisture levels. b. humus increases the movement of water and air in soil. c. humus decreases the porosity of soil. d. humus acts as the basis for soil life

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them