b. about 85% of the bodyâs phosphorus is located in bones and teeth. c. the phosphoric acid in cola drinks has little effect on bone content. d. the ratio of phosphorus to calcium in the diet is important for bone maintenance.
Grass that grows in undesirable locations, such as between the cracks of a sidewalk, can be killed with chemicals called non-selective herbicides. Every herbicide, even ones with the same active ingredient, can have different strengths. Therefore, purchase herbicides in a ready-to-use container for easy use.
Pre-emergent herbicides kill weeds as they germinate from their seeds. To be effective, pre-emergent herbicides are applied directly to the soil and spread with a light application of water. The herbicide makes a barrier of poison that reduces the chance of weed germination, says the University of Illinois.erbicides that require contact are sprayed onto the plant and absorbed through the waxy layer of the leaf. Contact herbicides will kill only the area they touch and do not kill the weed roots, meaning the weed may grow back, says the University of Illinois Extension.