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Pick at 3 of the cell types in Porifera and explain their function. OR Discuss sponge chemistry. What are sponge chemicals used for and what do humans use them for?

The flatworms were the first animals to:  (mark all that apply)

Charging affects backscattered electrons much more than secondary electrons.

When wanting to image a sample in cross-section, which method will provide the smoothest and flattest surface?

Say you are performing EDS mapping of a specimen composed of Al and Ga. When you generate your Al map, you notice that you have a rather high signal in regions when you should only have Ga present, dashed region in the image below. Furthermore, when you go back and perform a spectrum analysis on the dashed region, you do not see the presence of Al. In addition, the regions that do have aluminum only show a very small amount is present. The best explanation for this is _____:  

All of the following detectors are used in Auger analysis except which of the following?

In EDS, sum and escape peak artifacts become more significant at low count rates.

Which of the following SEM conditions will not increase the signal in CL?

What does James say about wealth? (select all that apply)

Tight junctions prevent movement of molecules across cell layers.