Which of the following is a germ layer that forms the lining of the urinary, respiratory, and digestive tracts?
A) mesoderm B) ectoderm C) endoderm D) embryonic disk
Answer: C
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Species diversity is decreasing on the planet and has been identified as a major problem by many ecologists. Therefore, it is important for scientists to identify habitats that support diversity and to reconstruct environments for maximum diversity. Describe an environment that would support a high species richness
What will be an ideal response?
The root tip is indicated by
a. A. b. B. c. C. d. D. e. E.
Which of the following would be a primary consumer?
A. tree B. decomposer C. carnivore D. herbivore
Which of the following statements about fish gills is true?
A) They have a large surface area. B) Because of their efficiency, they only need a small surface area. C) They have a poor blood supply. D) Like lungs, they have an exhale/inhale function.