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the core sample shown below was collected from a lake bed. every year, one dark layer and one light layer
formed. the dark layer is assumed to have formed during the six cooler months of the year, and the light
layer is assumed to have formed during the six warmer months of the year.
lake sediment core sample
based on only this scale drawing of the core sample, which statement explains the most likely interpretation
about sediment deposition in the lake?
a a large storm increased sediment deposition during year 2 of this sample.
b the rate of sediment deposition in the lake was constant during the five years represented by this sample.
c the rate of sediment deposition in the lake increased during the five years represented by this sample.
d a drought caused more sediment deposition in the lake during year 4 of this sample.

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?

What are the student's observations and inferences before he starts his investigation?