List three major evolutionary changes that occurred in animals, leading to greater complexity and specialization.

What will be an ideal response?


Bilateral symmetry, development of a coelom, segmentation, and a skeleton of some form.

Biology & Microbiology

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Buoyancy in pelicans is achieved by:

a. subcutaneous air sacs. b. fatty tissue. c. low density tissues. d. long feathery appendages. e. storing wax and oils.

Biology & Microbiology

in which of the following scenarios may a bactericidal drug be chosen

a. Your otherwise healthy patient has bacterial conjunctivitis caused by the Gram-negative bacterium Haemophilus aegyptius. b. Your otherwise healthy patient has pinworm caused by the roundworm Enterobius vermicularis. c. Your pediatric patient has bacterial meningitis caused by the Gram-positive bacterium Streptococcus agalactiae. d. Your immunocompromised patient has a severe case of infectious mononucleosis caused by Epstein Barr virus.

Biology & Microbiology

A ________ bond links two amino acids together.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Once produced, a zygote will divide by ________ to develop into a whole organism

Fill in the blank(s) with correct word

Biology & Microbiology