14. Describe the difference between the three macroinvertebrate categories and
give an example of each.

Invertebrates are the organisms in which backbone or vertebral column is absent.

The three macroinvertebrate categories are annelids, mollusks and arthropods.

Annelids are the organisms having segmented body. They are found in moist places. Examples are leeches and earth worms.

Mollusks are the organisms which are enclosed in a calcium carbonate shell. Examples are snails and slugs.

arthropods are the invertebrates which have segmented body and jointed appendages. Examples are insects and crustaceans etc.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called