True or False: Vertebrates may have an external skeletal system

A. true
B. false


B

Biology & Microbiology

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Which are tetrapods? Check all that apply.

_____ frogs _____ snakes _____ birds _____ humans _____ lungfish

Biology & Microbiology

An individual who avoids the pull of gravity is exhibiting

a. negative phototaxis. b. positive geotaxis. c. negative geotaxis. d. positive thigmotaxis.

Biology & Microbiology

Spontaneous hydrolysis reactions between DNA and surrounding water molecules commonly cause

A) pyrimidine dimer formation. B) depurination. C) tautomeric shift. D) double-stranded DNA breaks. E) deletion mutations.

Biology & Microbiology

The body fluids of an osmoconformer would be _____ with its _____ environment

A) isoosmotic; freshwater B) hyperosmotic; saltwater C) isoosmotic; saltwater D) hypoosmotic; saltwater

Biology & Microbiology