A sequence of organisms through which energy is transferred, beginning with the primary producer, is a Otrophic level
O food source
O food chain
O food web

the tricuspid valve is present between right atrium and right ventricle

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.