Fossilization can occur when (1) Animals are buried and preserved by natural processes (2) Animals are destroyed by the scavengers (3) Animals are eaten up by predators (4) Animals are destroyed by environmental conditions.

Explanation

To determine when fossilization can occur, we need to analyze each of the provided options:

1. **Animals are buried and preserved by natural processes**: This option describes the correct conditions for fossilization. Fossilization typically occurs when an organism is buried quickly after death, protecting it from decay and scavengers. Over time, natural processes, such as sedimentation, can lead to the preservation of the organism's remains.

2. **Animals are destroyed by scavengers**: This option is incorrect. If animals are destroyed by scavengers, there would be no remains left to fossilize. Scavengers consume the remains, preventing any chance of fossilization.

3. **Animals are eaten up by predators**: Similar to the previous option, this is also incorrect. If an animal is eaten by a predator, it does not leave behind remains that can undergo fossilization. The process of fossilization requires that the organism's remains are preserved, not consumed.

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