Question

1. the influx of individuals into a population from outside sources is known as: a. migration b. immigration c. emigration d. displacement 5. which process involves the breakdown of phosphate rocks, releasing phosphate ions into the soil? a. weathering b. sifting c. decomposition d. assimilation 6. where does the phosphorus cycle primarily occur? a. forests b. rocks c. oceans d. atmosphere

Explanation:

• For question 4, immigration is the movement of individuals into a population from outside sources. Migration is a more general term for movement, emigration is leaving a population, and displacement is forced movement often due to conflict or disaster.
• For question 5, weathering is the process that breaks down phosphate - rocks and releases phosphate ions into the soil. Sifting is a physical separation process, decomposition is the breakdown of organic matter, and assimilation is the uptake of nutrients by organisms.
• For question 6, the phosphorus cycle primarily occurs in rocks. Phosphorus is released from rocks through weathering and then moves through the ecosystem. It is not primarily in forests, oceans (although it can cycle there secondarily), or the atmosphere as phosphorus is not a major atmospheric component in its biogeochemical cycle.

Answer:

1. b. Immigration
2. a. Weathering
3. b. Rocks