The ocean is divided into distinct zones of marine life. Which three factors are used to define the zones? A. available sunlight, distance from shore, and water depth B. water temperature, salinity, and water depth C. sea-floor spreading, volcanic activity, and sedimentation rate D. available sunlight, salinity, and oxygen content of the water

Which of the following statements is true? a. the main cause for speciation is an increase in gene flow. b. organisms that reproduce asexually are not considered part of a species. c. on a tree of life diagram, speciation is shown by the merging of two different lineages. d.the size of the geographic area inhabited by a population can cause speciation.

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

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