1 Mechanical digestion is evident, where one can see the breaking down of large food particles into smaller ones after being ground by the teeth. 2  While the chemical changes that take place happen within the body and are not visible.
Using a pre-emergent herbicide around your property could stop these territorial plants from overtaking your home's most valued green space. Pre-emergent herbicide is a type of weed killer that prevents weed seeds from sprouting. Unlike normal herbicide, it is meant to stop weeds from growing in the first place by spraying or spreading a chemical onto the soil so that weeds have difficulty placing down their roots.
Many times a herbicide canât tell the difference between a âweedâ and your grass. Such is the case with pre-emergents and fescue. A pre-emergent chemical will prevent germination of ANY seed â weed or turfgrass.If you intend to seed a lawn, you CAN NOT use a pre-emergent before you plant nor can one be applied for several weeks thereafter.any times a herbicide canât tell the difference between a âweedâ and your grass. Such is the case with pre-emergents and fescue. A pre-emergent chemical will prevent germination of ANY seed â weed or turfgrass.