The correct answer for the question that is being presented above is this one: "oxygen became available from cyanobacteria." About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because oxygen became available from cyanobacteria.
The Pleistocene often colloquially referred to as the Ice Age) is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the world's most recent period of repeated glaciations. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology.
Sorry I took the test and got it wrong and all I can tell you is that it's not B ok?
Type of Erosion Control<span> </span>Pros of Using this Control
- Jetties - protect buildings on beaches from losing sand
- Breakwaters - Stop the waves from hitting the beach
- Beach Renourishment - easy way to prevent sand erosion
- Planting of dune grasses and plants - roots hold sand together and make it more difficult to wash away
Cons of Using this Control
- can seriously affect the tidal circulation and the health of wetlands
- changes profile of the beach
- can cause bottom organisms and habitats to e smothered by muddy water
- can make the beaches difficult to use for recreation
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</span> I think that Breakwaters<span> are the best to use. One reason is the only major con that is has is changing the profile of the beach instead of harming wildlife and taking away funding (recreational use.) Another reason is that the rocks used provide great climbing tools for beachgoers and might entertain them. A third reason is that breakwaters can be underground as well, not damaging the beach very much. Finally, they save millions of dollars in replacing sand.</span>
