You can rub a permanent magnet against something else that can be magnetized, like a paper clip.
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The First step in DNA replication is the unzipping the two strands. This process is carried out by the DNA helicase
From the information given, i can't give you an actual number. But I can tell you that if a rock has a high porosity (its very porous which means that liquids can easily pass through) and has high permeablilty (liquids are able to enter the rock with ease), then groundwater could flow through this rock easily and faster than a rock that has a low porosity and low permeability.
1. Each island is unique and has their own animals and food.
2. The animals adapt to the different stimuli (food, terrain, etc.) and pass their adaptations from generation to generation.
3. Stimuli affect how animals evolve throughout the years.
20% clay, 40% silt, and 40% sand