Some coral reefs off the east coast of South America are starting to die off. Satellite images reveal great plumes of sediment washing out of the mouths of rivers. What can you conclude, if anything, about the relationship between these two factors?

A. Although the two factors coincide, they are not likely to be related.
B. Deforestation on land results in lower oxygen levels in the atmosphere, which stresses the reef.
C. Deforestation on land allows erosion to wash away topsoil, which smothers reefs.
D. Burning of the rain forest increases atmospheric carbon dioxide to levels toxic to reefs.

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

What are some possible consequences of preventing prescribed burns and natural wildfires

You will create a molecular clock model for an arthropod gene. follow these guidelines to make your model: . your timeline will span from 90 million years ago to the present. the common ancestor in your model is an arthropod that lived 90 million years ago. the gene that you'll track codes for a protein in the species venom . the dna sequence youll track contains 10 nitrogen bases. you can choose the order of the bases and where the mutations occur. this gene mutates at a rate of approximately 0.76 base pairs every 17.1 million years. to build your model,/ calculate the estimated time period it takes for 1 base pair to mutate. the first time period will only show the common ancestor. at the beginning of the second time period, three lineages will diverge from the common ancestor, each with a different mutation in their gene sequences. the first and third descendant species will survive for the rest of the timeline. the second descendant species was extinct 50 million years ago. calculate how long it will take for one full base pair mutation to occur. explain your reasoning by constructing a mathematical equation