Genome sequencing of the bacterial symbionts of animals has allowed us to compare the genomic features of several symbionts. The following data was collected on two insect symbionts:
Symbiont A: 0.4 Mb genome, 20% G+C content, missing or incomplete peptidoglycan synthesis and nucleotide synthesis pathways.
Symbiont B: 1.8 Mb genome, 40% G+C content, peptidoglycan and most nucleotide synthesis pathways complete.
What can you deduce about these two insect symbionts based on their genomes?