How did space photography astronomers? a. it allowed them to capture images of black holes in distant galaxies. b. it facilitated the visual perception of electromagnetic radiation in the radio frequency. c. it enabled the identification of elements present in various celestial objects. d. it reveal changes in the position and appearance of celestial objects.

The answer is D it helped reveal changes in the position and apperance of celestial object

Option (D) is the correct answer.

Explanation:

Astronomers take photographs in the space so that they can get to know the previous and present position of celestial objects, astronomical objects etc.

This will also help them to know changes occurring in the space and if something unusual seems then they can research on it in order to know what exactly it is.

Therefore, we can conclude that space photography help astronomers as it helped reveal changes in the position and appearance of celestial objects.

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explanation:

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."