The answer is #4. The first and second one involve acid, which is chemical weathering. The third one involves oxidation, which is a chemical process. The only mechanical process is option four.
Answer:
- covers and lines body surfaces
- minimal intercellular substance
- cells are densley packed together
- cells rest on basement membrane
- simple (single line of cells) and stratified (multiple layers)
- squamous (oval like shape), cuboidal (cube shape), columnar (long rectangle shape)
- vascular (tissue doesn't have its own blood supply)
Explanation:
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A gene contains the genetic instructions for making proteins.
