1. what special structures are specific to the phylums of porifera, cnidaria, ctenophora, and platyhelminthes?

Sampling lake water for microscopic organisms is not as easy as it sounds when you want to both count and identify species. in a given water sample, your bacteria of choice can be rare or difficult to culture, particularly given the mixture of bacteria in a biofilm. which of the following culture media would be best for growing fecal coliforms when they are relatively less abundant than other bacteria in the lake? anaerobic culture medium enrichment culture medium complex culture medium basic culture medium

Why is excretion necessary to maintain homeostasis?

Acquired mutations can result from radiation pollution toxins inheritence select all that apply