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an animal that feeds directly on secondary consumers.
the region of the kidney where the renal artery enters, and where the renal vein and the ureter...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
the control of an invasive species using the species' natural enemies (biocontrol agents)...
an atmospheric gas made of three oxygen molecules bonded together (O3).
the part of the hindbrain that controls autonomic functions such as breathing, digestion, heart...