Where did earth's oxygen come from? select one: a. produced by volcano exhausts. b. produced during the formation of the moon. c. produced by microscopic life over a billion years. d. delivered by comets to the early earth?

Is there any danger to eating mold?

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

What happens during the experiment stage of the scientific method