Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
Answer:
b. quantitative observation
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Answer:
Testing Platismatia glauca could help scientists understand which pollutants have the largest effect on lichen populations. It also may help scientists understand the current pollutant levels in the atmosphere compared to the population of lichens on the trees. This information can help them more accurately predict population changes over time.
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6CO2 + 6H2O ------> C6H12O6 + 6O2
Answer: Embryonic stem cells
Explanation: Cell differentiation is the process whereby an immature cell evolves to specialized form to perform its function. It take place in Embryonic stem cells.
