What is true of introduced species? Check all that apply.
_____ They can be brought into their introduced range by humans
_____ They are all native to the tropics.
_____ They can be moved by natural forces from their native range to their introduced range.
_____ They are always best controlled with biological control.
_____ They will spread aggressively and out compete native species.
__X__ They can be brought into their introduced range by humans
_____ They are all native to the tropics.
__X__ They can be moved by natural forces from their native range to their introduced range.
_____ They are always best controlled with biological control.
_____ They will spread aggressively and out compete native species.
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A CD8+ T cell binds to an antigen only if this antigen is____
a. in a complex with a class I MHC protein b. in a complex with a class II MHC protein c. in a complex with a class III MHC protein d. not in a complex with MHC proteins e. presented on the surface of a B cell
In insects, air enters through a ____ and is delivered to interstitial fluid
a. spicule b. spiracle c. stoma d. foramen e. gill
Meat, fruits, and vegetables could be contaminated with E. coli strains toxic to humans when they come in contact with
animal I. feces ____. II. urine III. blood
a. I only b. I and II c. II and III d. I and III e. I, II, and III
One difference between cardiac muscle fibers and skeletal muscle fibers is that cardiac muscle fibers:a
have several nuclei, while skeletal muscle fibers do not. b. are not striated, while skeletal muscle fibers are. c. are under voluntary control, while skeletal muscle fibers are not. d. branch and form complex networks, while skeletal muscle fibers do not. e. are cylindrical-shaped, while skeletal muscle fibers are spindle-shaped.