The diagram above shows some evolutionary pathways. Each letter represents a different species. If A represents a simple multicellular heterotrophic organism, B would most likely represent a complex multicellular virus
another type of simple multicellular heterotroph
autotrophic mammal
single-cell photosynthetic organism

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

Which blood cell spend most of their time in the lymphatic system?

How does secondary succession differ from primary succession?