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amino acids antibiotics babies bacteria balance bats become pests bees biodiversity birds blood body burn called camote cancer carbohydrates carbon dioxide cause Chapter chemical fertilizers chickens compost cover crop cycle damage dangerous deer destroy destroyer cells develop digest diseases earth ecosystem eggs energy environment farm farmer field fish forest fruit fungi fungus garden genes germs grasses grow hagonoy harvest healthy hectare herbicides immune system insects keep kill kinds kohol leaves lichens live manure meat minerals mountain multiply mycorrhiza nitrogen nutrients ocean orchard oxygen parasites percolation person pesticides pests Philippines pioneer species plants and animals poisons predators probably problem produce protect proteins rain rats recycle remove rice roots rotifers scavengers scientists sea urchins seedlings seeds selective breeding sequester shrubs sick soil symbiotic relationship trees upland urine usually vegetables vitamins wasps wastes water cycle weeds wolves worms