Question

place the terms in the appropriate blanks to complete the sentences. show instructions passive transport more concentrated less concentrated active transport 1. when molecules move down their concentration gradient, they move from where they are to where they are. 2. diffusion across a biological membrane is called

Explanation:

1. By definition, moving down a concentration gradient means moving from an area of higher concentration to an area of lower concentration.
2. Diffusion across a biological membrane is a type of passive transport as it does not require energy input and molecules move down their concentration gradient.

Answer:

1. more concentrated; less concentrated
2. passive transport