Lesson 3 : wrapping up unit 3

9 The water levels are constant in estuaries

Explanation:

10.  Black sands are found when tides are particularly higher.11. Both tides and currents are predictable movements of water.12. The salinity of brackish water can vary with the tides.13. The barnacles attach themselves to seaweed and feed on it.14. Ocean helps to lessen global warming by absorbing lots of carbon dioxide.15. Five Solomon islands have disappeared because of erosion and increasing seas.16. Bottom-feeding fish are not part of the benthic community.

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.

Mars and earth have quite a few things in common. both are  terrestrial planets, both are located within the sun’s  habitable zone, both have  polar ice caps, similarly  tilted axes, and similar  variations in temperature. and according to some of the latest scientific data obtained by rovers and atmospheric probes, it is now known that mars once had a  dense atmosphere  and was covered with  warm, flowing water.