Across
- 3. This cycle is critical as it's a component in ATP, DNA, and phospholipids in cell membranes.
- 5. this type of cycle is the movement of a particular chemical through the biotic and abiotic components of an ecosystem.
- 6. About 78% of Earth’s atmosphere is composed of
Down
- 1. Under certain conditions, the burial process stores that carbon in Earth's crust where, over millions of years, it becomes.
- 2. is present in most chemical compounds that make up living things, called this cycle.
- 4. this cycle is also known as the water cycle.
- 7. a product of photosynthesis that is released into the atmosphere in this cycle.