Question

19 fill in the blank 1 point diffusion of molecules through channels and facilitated transport are types of choose your answer... transport. 20 fill in the blank 1 point microtubules and microfilaments compose the type your answer..., which forms an internal network of support for the cell.

Explanation:

1. For question 19: Channel-mediated diffusion and facilitated transport both involve movement of molecules down their concentration gradient without energy input, which defines passive transport.
2. For question 20: Microtubules and microfilaments are key structural components that make up the cell's internal support network called the cytoskeleton.

Answer:

1. passive
2. cytoskeleton