Glaciers can only form when a) there is an ice age b) there is a u-shaped valley in the mountains c) the amount of snow exceeds the amount of rain d) more snow falls than melts

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

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 of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d