Less than 2% of the human genome consists of . a) intergenic sequence b) exons c) introns d) repetitive DNA e) all of the above

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.

What are the student's observations and inferences before he starts his investigation?

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil