An actin gene in humans is 92% identical to the homologous
actin gene in mice. An actin gene
in humans is 80% identical to the
homologous gene in yeast. What
does this say about how long ago
these organisms had a common
ancestor?

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.

What type of tree is the tallest tree in the world?