Explain how an action potential is generated. Sodium ion channels on one end of an axon suddenly open to allow the accumulation of positive sodium ions, making the voltage on that end positive, creating a length‑wise imbalance in the potential with the opposite, negative end. A group of positive potassium ions collects next to an axon, inducing a positive potential on the axon surface. The positive potassium ions suddenly disperse, making the potential on the axon surface suddenly flip sign. When the negative potential inside an axon becomes slightly less negative, sodium ion channels open, allowing positive sodium ions to rush into the axon, flipping the internal potential to a positive value. Potassium channels of an axon suddenly open to allow positive potassium ions to rush out of the axon. When enough leave, the potential inside the axon becomes negative, and the potassium ions rush back in, flipping the potential.

Clues to ecological principles are given in numerous passages of the bible. a bible study of ecology actually opens the doors to better understanding of god's love and concern for the earth. use a concordance to locate bible passages associated with words concerning our stewardship of the earth. you may use a dictionary to find synonyms for these words: dominion replenish subdue judgment stewardship find each of the passages using these words related to principles of ecology. list all passages by quote, book, chapter, and verse under each word. use your own interpretation to rewrite what you think each verse is saying. after your discussion of each of these words, ask one other person to explain his understanding of the word and a related verse without any hints. summarize what he tells you. a concluding paragraph for each of the words should be written noting similarities and differences between your interpretation and that of each person consulted.

Which is the correct order in the scientific process? ask a question ® form a hypothesis ® make an observation ask a question ® make an observation ® form a hypothesis make an observation ® form a hypothesis ® ask a question make an observation ® ask a question ® form a hypothesis

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.