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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The root tip is indicated by
a. A. b. B. c. C. d. D. e. E.
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.
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?
Which of the following would be a primary consumer?
A. tree B. decomposer C. carnivore D. herbivore