How heroin affects function of synapes

What role do bacteria play in the carbon cycle

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

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.