Hi Joshua, I think A, H and probably I are anisopteran odonate larvae (dragonflies); C is a zygopteran odonate larva (damselfly); B is a sinistral gastropod mollusc, perhaps family Physidae (bladder or marsh snails); F is a bivalve mollusc, perhaps family Corbiculidae (marsh clams); I is an oligochaete worm, perhaps family Lumbriculidae; E is perhaps a dipteran (fly) adult, and D shows no identification features. I would think all came from a marshy floodplain, but the photos are unfortunately too poor for accurate identification, which depends on fine detail.

Thank you Dr. Reynolds for you help. 

I agree with Julian's answers: AHI; Anisoptera; CG: Zygoptera; B: Physidae; F: Corbiculidae. However I think that D is a Gyrinidae beetle and E a Veliidae adult. I is an oligochaet, but next to Lumbriculidae as suggested by Julian it may also be Branchiura sowerbyi.

Thank you so much Dr. Ton Van Haaren. This is very helpful for initial diagnosis.