"active transport is when molecules diffuse from a higher concentration to a lower concentration. facilitated transport is when proteins that extend through the cell membrane provide a channel through which certain substances can diffuse more rapidly than by passive diffusion. the lipid bilayer opens up, allows the ions or molecules to enter the cell, and then closes. diffusion, or passive transport, is when molecules diffuse from a lower concentration to a higher concentration."

Are characterized by dry conditions, limited vegetation and wide temperature range. a.) tropical rain forests b.) deserts c.) grasslands d.) none of the above

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.

Which was not a reason why canals were built in florida