Non vertebrate chordates nervous systems

Explanation:

This phylum also includes two groups that don't have backbones. The nonvertebrate species in the phylum Chordata (nonvertebrate chordates) are exclusively marine organisms. They include the tunicates and the lancelets of the subphyla Urochordata and Cephalochordata respectively.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

it creates acid rain