The ears work with the brain and other body parts through a series of steps that help you hear the sound of a train coming. What step must happen before your brain recognizes that this is the sound of a train moving? Your brain sends a message through the nerves to the muscles in your legs.
Your ears send a message through the nerves to the brain.
Your leg muscles pull on the bones as you move out of the way.
Your eyes pick up the sound waves as you see the train coming.

The cluster of developing cells from conception until birth is called an

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.

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis