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What type of lipids are found in all biological membranes?

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

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.