Answer:
The analysis of protein structure by frozen electron microscopy can be divided into three processes：
1. Sample preparation: the biomacromolecule sample is frozen rapidly in liquid nitrogen, and the water in the macromolecule exists in the form of glass.
2. Data collection: irradiate the sample and the ice near the sample with low energy electron beam, and record the scattered signal with detector.
3. Three dimensional reconstruction to build protein model: three-dimensional structure of protein is built by two-dimensional projection from different angles.
Explanation:
https://www.creative-biostructure.com/Data-Processing-and-Interpretation-584.htm
The classification system for organisms has changed from seven levels to eight. This happened because scientific consensus changed as scientists learned more about organisms.
Answer: Proxy Sources (Also known as Climate proxies)
<span>Natural archives like tree rings, ocean sediments, tree pollen and ice cores, just to mention a few, are examples of climate proxies. They information gathered from these sources are used to estimate historical climate conditions.</span>
