Answer:
Homologous chromosomes are two pieces of DNA within a diploid organism which carry the same genes,
Insects is largest if you want marine life it would be crustaceans which are the second largest group of arthropods
Answer:
Rock particles can become pollutants by/from the wind. That is called erosion.
They can also become pollutants from man-made tools. For example a tool the polishes rocks releases all the dust and powder substance from the rock into the atmosphere.
There are also minute volcanic which are rock fragments formed during explosive shattering of sticky magma.