Which of the following statements describe situations of passive transport across a cell membrane? (Choose all that apply) -A cell uses energy to move molecules across a membrane from an area of lower concentration to an area of higher concentration.
-Water is moved across a membrane to dilute a molecule that is highly concentrated on the other side.
-A cell removes specific molecules through a membrane based on size.
-A molecule disperses to create a uniform concentration throughout a solution

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.