What's the answer to number 17 and 18?

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

What is the importance of having the us forest service, the bureau of land management, the us fish and wildlife service, and the national park service? to manage land resources for conservation and the development of natural resources to manage land resources for conservation and the development of urban areas to preserve historical landmarks and manage the development of urban areas to preserve historical landmarks and manage the development of rural areas