Most marine animals have specially designed fibrous respiratory organs called that exchange oxygen and carbon dioxide directly with seawater.

What is the difference between an igneous, sedimentary and metamorphic rock

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.

Why are current extinctions of concern to enviromentalists?