The conversion of nitrogen gas to compounds useful to crops is called

nitrogen fixation
nitrogen compounding
nitrogen conversion
nitrogen fusion

Although there are a limited number of amino acids many different types of proteins exist because..

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

What is the role of the phospholipid belayer in cellular transport in living cells