Which Ecdysozoan phylum contains three-quarters of the known animal species?
a. Nemertea
b. Annelida
c. Arthropoda
d. Nematoda
Ans: c. Arthropoda
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Why is the process of peer review critical to scientific inquiry?
a. It protects scientists from being sued. b. It gives scientists a patent for their ideas and methods. c. It helps ensure that the research in a scientific paper is original, significant, logical, and thorough. d. It provides a venue where scientists can publish their materials and protocols for use by other scientists who want to do the same research.
The soil in a particular area is arranged in layers called horizons that vary in texture, structure, and consistency from one another
Indicate whether the statement is true or false
Clues from geology and paleontology suggest that simple cells or their precursors arose about.
A. six billion years ago. B. six million years ago. C. four billion years ago. D. four million years ago. E. one million years ago.
The study of behavior in natural environments from an evolutionary perspective is called:a
ethology. b. animal behavior. c. behavioral ecology. d. behavioral ethology. e. direct fitness.