Select the correct answer from each drop-down menu. Complete the passage about the nitrogen cycle.

During nitrogen fixation, specialized bacteria living in Earth’s convert nitrogen taken from the into ammonia. Another set of bacteria convert the ammonia to compounds called nitrates that plants and animals can use.

1. A. cryosphere, B. geosphere, C. atmosphere
2. A. hydrosphere, B. atmosphere, C. geosphere

What evidence could be used to convince policy makers to change a shipping lane from going through a whale breeding ground? information on the number of all whale species currently alive information on the number of all whales hit by boats in the given area information on the number of whale deaths in the world's oceans information on the number of whale offspring born every year. (a) scientists could collect and combine data on fish populations all around the world to show that their populations are declining. (b) scientists collect and combine data on fish populations all around the world to show that their populations are increasing. (c) scientists work together and use past data to show that fish populations are becoming locally extinct in some areas. (d) scientists work together and use past data to show that some fish populations are adapting to environmental changes.