Scientists in Chicago measure the amount of oxygen and carbon dioxide in Lake Michigan. This helps them determine the health of the lake ecosystem. In July, scientists noticed a large decrease in oxygen levels in the lake. The decrease in oxygen could be due to: a) A decrease in fish populations.
b) A decrease in plant growth.
c) An increase in plant growth.
d) An increase in rain water supplied to the lake.

What links the two strands in a dna helix together in the middle? a. phosphate groups b. sugar rings bonded together c. proteins d. bases with hydrogen bonds

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

Give two examples of what would occur if one of the pairs did not match or had an extra chromosomes. explain how this might occur, and if it would be dangerous to the individual. fast.