Which feature is unique to echinoderms?

a. Water-vascular system
b. Radial symmetry
c. Cephalothorax
d. Ability to regenerate body parts
e. Bilateral symmetry


a

Biology & Microbiology

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__________ are produced in organs known as __________

a. Gametes; gonads b. Gonads; gametes c. Sperm; spermatocytes d. Eggs; uterus

Biology & Microbiology

Tertiary consumers feed directly on _____

a. carnivores b. producers c. herbivores d. parasites e. decomposers

Biology & Microbiology

Proto-oncogenes can be converted to oncogenes by:

a. mutation. b. tumor suppressor genes. c. growth factors. d. transcription factors. e. infection by certain viruses.

Biology & Microbiology

Which option would be the LEAST effective initial line of defense against pathogens?

A. Lysosomes in the fluid bathing the eye B. Thick mucus coating the trachea C. Thin, unkeratinized skin of a salamander D. Exoskeleton of a beetle E. Strong stomach acid

Biology & Microbiology