19. Which of the following describes the mode of reproduction of a moss? A. They are reproduced through their seeds C. They are reproduced through their stems B. They are reproduced through their spores D. They are reproduced through their roots 20 Which of the following describes the mode of reproduction of a fern? A. They are reproduced through their seeds C. They are reproduced through their stems B. They are reproduced through their spores D. They are reproduced through their roots 21. When river meets the sea, which of the two main properties of water were affected? A salinity and Ph C. salinity and temperature B. temperature and Ph D. temperature and dissolved oxygen 24. If the planktons are removed from the estuary, what may happen to the estuarine food web? A. Planktons are producers so their removal may not have an effect B. The other animals in the estuary will have to find other food sources. C. Removal of any organism like the planktons will greatly affect the ecosystem. D. Filter feeders like oysters and clams don't depend on the presence of planktons.

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