Question

1. humans need calcium to build their bones and control their muscle movements and nerve impulses. calcium is found in rock deposits, in the shells of marine organisms, in ocean sediments, and in soil that is formed from the erosion of rock. which terms correctly identify where calcium can be found on earth? 1. geosphere 2. hydrosphere 3. atmosphere 4. biosphere a) 1 and 3 only b) 2,3, and 4 only c) 1 only d) 1,2, and 4 only

Explanation:

Step1: Analyze each sphere

• Geosphere: Calcium in rock deposits, soil (from rock erosion) → geosphere (1) includes these.
• Hydrosphere: Ocean sediments (part of hydrosphere) → calcium here (2).
• Atmosphere: No mention of calcium in atmosphere → exclude (3).
• Biosphere: Shells of marine organisms (living organisms, biosphere) → calcium here (4).

Step2: Evaluate options

• Option A: 1 and 3 only → 3 is wrong, eliminate.
• Option B: 2,3,4 only → 3 is wrong, eliminate.
• Option C: 1 only → 2 and 4 also have calcium, eliminate.
• Option D: 1,2,4 only → Matches geosphere (1), hydrosphere (2), biosphere (4).

Answer:

D) 1,2, and 4 only