The main organs of the excretory system are the kidneys and bladder kidneys and skin bladder and blood renal artery and pulmonary artery

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

Imagine you are introducing the lac operan and the trp operon to students who have never learned about it before. complete the table to compare the similarities and differences between the two operons

The negative impacts of nonnative species generally outweigh the positive impacts