(1) Many farmers use manure to fertilize farm ground and pastures because it is relatively cheap and replenishes nutrients and organic matter.(2) Males compete to fertilize eggs, and a week or two after spawning adults of both sexes die.(3) How can we fertilize neglected land for best productivity while preparing it for organic certification down the road?(4) The male will follow behind the female and fertilize the eggs as they are laid.(5) Shinohara and his colleagues used a recently developed technique called in vitro microinsemination to fertilize rat eggs with mouse-grown rat sperm.(6) They will build a dam for the cattle to drink from, and they will fertilize the soil with manure.(7) Soils may harbor 50 to 500 earthworms per square meter; they keep soils aerated, and their castings fertilize the soil.(8) She prepared the nursery herself and used material like gypsum and neem cake (made with neem seeds) to fertilize the land.(9) After this process is complete a male bull trout (usually only one) will fertilize eggs deposited by the female.(10) The female needs a male to fertilize her egg, even though it is she who carries offspring through pregnancy and childbirth.(11) When the only other dead member of our party died, we buried him in the soil to fertilize the land.(12) At the end of the nineteenth century, burning forest biomass to clear land and fertilize the soil was used only occasionally on the Continent.(13) When fertility laboratories fertilize eggs, grow embryos to the same developmental stage as the embryo clones and implant them in a human uterus, 40 to 60 percent end up as babies.(14) This procedure is repeated until all the eggs are laid, with the male looping himself round the female each time to fertilize the eggs as she lays them.(15) The mother could also have both male and female reproductive characteristics giving her the ability to fertilize her own eggs.(16) Biologists knew from studies on a wide range of animals that males compete with other males to fertilize eggs and that females choose potential mates based on the males' appearance and, perhaps, even on their sperm.