Bayer and Monsanto are seeking approval after the EU and other antitrust bodies already cleared the merger of Dow Chemical Co. and DuPont Co. as well as China National Chemical Corp.'s roughly $43 billion takeover of Swiss seed and pesticide maker Syngenta AG. The companies made considerable divestitures to win approval in both cases. In spelling out its concerns about the Bayer and Monsanto deal, the EU said the two companies have a high market share in breeding or licensing -- and in some cases both -- vegetable, canola and cotton seeds.