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.
latent virus. A virus that has the ability to infect the host, initially causing little or no evidence of illness but persisting for the lifetime of the infected host; later on, a specific triggering mechanism may cause the virus to produce a clinically apparent disease.atent virus. A virus that has the ability to infect the host, initially causing little or no evidence of illness but persisting for the lifetime of the infected host; later on, a specific triggering mechanism may cause the virus to produce a clinically apparent disease.