Which of the following statements about human impact on trees is true? a. human activity always has a negative impact on trees. b. all human uses of trees require destruction of the trees. c. human activity has had both a positive and negative impact on trees. d. cutting down trees is the only activity that has a negative impact on trees. select the best answer from the choices provided a b c d

When in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? view available hint(s)when in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? active transportexocytosis

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13