Why can radio telescopes be used 24 hours a day?

a They are not affected by Earth’s atmosphere.

b They do not need visible light to obtain images.

c They are under protective domes.

d They do not run out of power.

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.