Ethan is giving a highly technical presentation on biomedical engineering involving several working models, computerized graphs, and video clips to a small group of doctors, scientists, and engineers. which two characteristics of public speaking should he be most concerned with during his preparation?

Channel and Message.

Explanation:

I'm assuming the answer choices you'v e been given are:

a. delivery and audience

b. noise and delivery

c. channel and message

d. none of the above

And the most correct here is channel and message. He must speak with proper technical terms and factual information (message) so that he can convey his message properly to his audience (channel)

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martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.  

a structured set of data held in a computer, especially one that is accessible in various ways. here is an example

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