Why do some scientists believe that rna rather than dna was the first genetic material?

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.

Diffusion and osmosis are forms of passive transport

Omg substrates with the same size and shape as the active site will bind to the enzyme. why is the key labeled the “bad” substrate?