Q5.9. As you saw in Section 2 ("DO or Die"), fish are sometimes lost from lakes as eutrophication occurs. Given what you've learned in this lab about why these fish kills occur, which of the following might help prevent fish kills as phosphorus
concentrations increase?

the answer is b.) hydrogen bonds between bases.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.